VOS3000 Authorization Type Hierarchy, VOS3000 Reverse Charging, VOS3000 DID DDI Numbers, VOS3000 Call Forwarding Types, VOS3000 Do Not Disturb Mode, VOS3000 Display Caller ID Forwarding, VOS3000 Monthly Consumption Limits, VOS3000 IVR Callback Timing, VOS3000 IVR Call State UDP Reporting, VOS3000 IVR Codec Priority, VOS3000 IVR Voicemail Navigation, VOS3000 IVR Custom Ringback Tone, VOS3000 IVR DTMF Parse Mode, VOS3000 IVR Voicemail System, VOS3000 authorization type hierarchy, VOS3000 reverse charging configuration, VOS3000 DID DDI numbers, VOS3000 call forwarding types, VOS3000 do not disturb mode, VOS3000 display caller ID forwarding, VOS3000 monthly consumption limits, VOS3000 IVR callback timing, VOS3000 IVR call state UDP, VOS3000 IVR codec priority, VOS3000 IVR inband DTMF detection, VOS3000 IVR DTMF parse mode, VOS3000 IVR voicemail system, VOS3000 IVR voice alarm configuration, VOS3000 IVR custom ringback tone, VOS3000 IVR voicemail navigation

VOS3000 Display Caller ID Forwarding Important Flexible Number Presentation Control

April 30, 2026April 30, 2026 king

VOS3000 Display Caller ID Forwarding: Flexible Number Presentation Control

📞 When a call is forwarded from your VOS3000 phone extension to another number, what does the called party see on their display? Do they see your original caller’s number, or do they see your extension’s number? The answer is controlled by the VOS3000 display caller ID forwarding settings — a set of per-phone and system-level configurations that determine which number is presented in three distinct call scenarios: normal forwarding, normal call transfer, and attended (ask) call transfer. 🎯

📋 According to the official VOS3000 V2.1.9.07 Manual, Section 2.5.2 (Supplementary Service), the display and forwarding number presentation offers three options for each scenario: Default (use the system parameter setting), Original caller (display the caller’s number), and Local number (display the phone’s own number). These settings interact with system-level parameters like SS_CALL_FORWARD_USING_ORIGINAL_CALLER, SS_CALL_TRANSFER_NORMAL_DISPLAY, and SS_CALL_TRANSFER_ASK_DISPLAY. 🔄

🔧 All data in this guide is sourced exclusively from the official VOS3000 V2.1.9.07 Manual, Section 2.5.2 — no fabricated values, no guesswork. For expert assistance with your VOS3000 deployment, contact us on WhatsApp at +8801911119966. 💡

🔐 What Is VOS3000 Display Caller ID Forwarding?

⏱️ The VOS3000 display caller ID forwarding settings control which telephone number is presented to the called party in different call scenarios. When a call is forwarded or transferred, there are always at least two parties involved: the original caller and the forwarding phone. The question is: which number should appear on the final called party’s display? 📋 VOS3000 Display Caller ID Forwarding

📌 According to the official VOS3000 V2.1.9.07 Manual, Section 2.5.2:

Setting	Options	Manual Description
📋 Forward display number	Default / Original caller / Local number	Controls which number is displayed when call is forwarded
📞 Normal call transfer display	Default / Original caller / Local number	Controls which number is displayed on normal transfer
🔄 Ask call transfer display	Default / Original caller / Local number	Controls which number is displayed on attended transfer
📞 Display caller id	On / Off	Display the caller’s ID — controls whether caller ID is shown at all

💡 Key insight: The VOS3000 manual provides three display options for each scenario. “Default” means the system-level parameter is used — this allows administrators to set a global policy while still permitting per-phone overrides. “Original caller” passes through the calling party’s number (the person who initiated the call). “Local number” substitutes the forwarding phone’s own number, effectively hiding the original caller’s identity. 🔒

🎯 Why VOS3000 Display Caller ID Forwarding Matters

⚠️ Incorrect caller ID presentation on forwarded calls causes several problems:

📞 Missed callbacks: If a forwarded call shows the forwarding phone’s number instead of the original caller, the called party cannot call the original person back directly
🏢 Privacy concerns: Some callers do not want their number passed through to third parties when calls are forwarded — their number should remain private
🔄 Brand identity: Businesses want their company number (not the employee’s personal extension) displayed when calls are forwarded to external parties
📊 Caller confusion: When the called party sees an unfamiliar number, they may not answer — reducing call completion rates for forwarded calls
🛡️ Regulatory compliance: Some jurisdictions have strict rules about caller ID presentation on forwarded and transferred calls

⚙️ Forward Display Number — Three Options Explained

🔄 The VOS3000 display caller ID forwarding “Forward display number” setting controls what the final called party sees when a call is forwarded from this phone. The VOS3000 manual provides three options, each with distinct behavior: 📡 VOS3000 Display Caller ID Forwarding

Option	Manual Description	What the Called Party Sees
📋 Default	Use “Softswitch management > Additional settings > System parameter > SS_CALL_FORWARD_USING_ORIGINAL_CALLER”	Depends on the system parameter — either Original caller or Local number
📞 Original caller	Display caller’s number	The original caller’s number is shown (e.g., the external caller who dialed in)
🏠 Local number	Display the phone’s number	The forwarding phone’s own number is shown (hides the original caller’s identity)

📞 Forward Display Number — Example Scenario:

External Caller (Alice): +1-555-0101
    │
    └── Calls Phone Extension 2001 (Bob)
        │
        └── Bob's phone forwards to Extension 3001 (Carol)

    ┌──────────────────────────────────────────────────────────────────┐
    │  What does Carol see on her display?                            │
    │                                                                  │
    │  Option: Original caller → Carol sees +1-555-0101 (Alice)      │
    │  Option: Local number    → Carol sees 2001 (Bob's extension)    │
    │  Option: Default         → Depends on SS_CALL_FORWARD setting   │
    └──────────────────────────────────────────────────────────────────┘

📊 Practical impact: If you choose “Original caller,” Carol can call Alice back directly because she sees Alice’s number. If you choose “Local number,” Carol sees Bob’s extension and can call Bob back — but she does not know Alice’s number. For help choosing the right setting, reach us on WhatsApp at +8801911119966. 📱 VOS3000 Display Caller ID Forwarding

📋 Call Transfer Display — Normal and Ask Transfer

🔑 In addition to forward display number, VOS3000 provides separate display settings for call transfers. The VOS3000 manual distinguishes between “Normal call transfer display” and “Ask call transfer display,” each with the same three options (Default, Original caller, Local number). 🛠️

Setting	System Parameter (when Default)	Description
Forward display number	SS_CALL_FORWARD_USING_ORIGINAL_CALLER	Controls caller ID on forwarded calls (call forwarding types)
Normal call transfer display	SS_CALL_TRANSFER_NORMAL_DISPLAY	Controls caller ID on blind/immediate transfers (1, 9 DTMF codes)
Ask call transfer display	SS_CALL_TRANSFER_ASK_DISPLAY	Controls caller ID on attended/consultation transfers (2, 3 DTMF codes)

💡 Why separate settings? The VOS3000 manual provides distinct display options for each transfer type because the business requirements may differ. For blind transfers (normal), you might want to show the original caller so the recipient knows who is calling. For attended transfers (ask), where the transferring party speaks with the recipient first, you might prefer to show the local number since the recipient already knows the context. For more on transfer DTMF codes, see our VOS3000 account billing reference. 📖

🔗 System Parameters for Default Caller ID Behavior

📋 When the per-phone display setting is set to “Default,” VOS3000 uses the corresponding system parameter to determine the caller ID presentation. These system parameters are configured in the softswitch management additional settings: 🛠️ VOS3000 Display Caller ID Forwarding

Parameter	Controls	Location
SS_CALL_FORWARD_USING_ORIGINAL_CALLER	Default behavior for Forward display number	Softswitch management > Additional settings > System parameter
SS_CALL_TRANSFER_NORMAL_DISPLAY	Default behavior for Normal call transfer display	Softswitch management > Additional settings > System parameter
SS_CALL_TRANSFER_ASK_DISPLAY	Default behavior for Ask call transfer display	Softswitch management > Additional settings > System parameter

📍 Best practice: Set the system parameters to your organization’s default preference, then use per-phone overrides for specific extensions that need different behavior. This provides a global policy with per-exception flexibility. For more on system parameters, see our VOS3000 parameter description guide. 📖

🛡️ Common VOS3000 Display Caller ID Problems and Solutions

❌ Problem 1: Forwarded Calls Show Wrong Number

🔍 Symptom: When a call is forwarded from Phone A to Phone B, Phone B’s display shows Phone A’s extension number instead of the original external caller’s number.

💡 Cause: The “Forward display number” setting on Phone A is set to “Local number” (or the Default system parameter is configured for local number display).

✅ Solutions:

📋 Change the “Forward display number” setting on Phone A to “Original caller”
🔧 If set to “Default,” change the SS_CALL_FORWARD_USING_ORIGINAL_CALLER system parameter
🔍 Verify the change by testing a forwarded call and checking the called party’s display

❌ Problem 2: Caller ID Privacy Breach on Transferred Calls

🔍 Symptom: When a call is transferred to an external number, the original caller’s number is displayed to the external party — potentially violating privacy expectations.

💡 Cause: The transfer display setting is configured to “Original caller,” which passes the original caller’s number through to the transferred destination, even if that destination is external. VOS3000 Display Caller ID Forwarding

✅ Solutions:

🔐 Change the transfer display setting to “Local number” for phones that transfer calls to external parties
📋 Configure “Normal call transfer display” and “Ask call transfer display” per your privacy requirements
📞 Use “Local number” for external transfers and “Original caller” for internal transfers

❌ Problem 3: Display Caller ID Toggle Not Working

🔍 Symptom: The “Display caller id” supplementary service is enabled/disabled, but caller ID presentation does not change — callers always see the number or never see it.

💡 Cause: The “Display caller id” setting controls whether the phone’s caller ID is shown at all. If set to Off, the phone’s number should not be presented. However, some SIP providers and gateway configurations may override this setting at the network level.

✅ Solutions:

📋 Verify the “Display caller id” checkbox is properly set in Supplementary service
🔍 Check if the mapping gateway or routing gateway has caller ID override settings
📞 Test with an external call to see if the carrier is overriding the caller ID presentation

📊 VOS3000 Display Caller ID Configuration Checklist

✅ Use this checklist when configuring caller ID display settings:

Check	Action	Status
📌 1	Set system parameters (SS_CALL_FORWARD_USING_ORIGINAL_CALLER, etc.) to your organization’s default	☐
📌 2	Configure per-phone “Forward display number” based on business requirements	☐
📌 3	Configure “Normal call transfer display” and “Ask call transfer display” per phone	☐
📌 4	Enable “Display caller id” supplementary service where caller ID should be shown	☐
📌 5	Test forwarded calls to verify the correct number is displayed	☐
📌 6	Test transferred calls (both blind and attended) to verify display behavior	☐

📞 For expert guidance on VOS3000 caller ID configuration, reach us on WhatsApp at +8801911119966. 💡 VOS3000 Display Caller ID Forwarding

❓ Frequently Asked Questions

❓ What is VOS3000 display caller ID forwarding?

📞 VOS3000 display caller ID forwarding is a set of per-phone settings that control which telephone number is presented to the called party when calls are forwarded or transferred. According to the VOS3000 V2.1.9.07 Manual (Section 2.5.2), there are three display options for each scenario: Default (use system parameter), Original caller (show the caller’s number), and Local number (show the phone’s own number). These settings apply to forwarded calls, blind transfers, and attended transfers independently. 📋

❓ What is the difference between Original caller and Local number?

🔄 “Original caller” displays the number of the person who originally initiated the call — the external caller’s number is passed through to the forwarded/transfered destination. “Local number” displays the forwarding phone’s own number instead — the original caller’s identity is hidden and replaced with the forwarding extension’s number. For example, if Alice (+1-555-0101) calls Bob (ext 2001) and Bob forwards to Carol (ext 3001): Original caller → Carol sees +1-555-0101; Local number → Carol sees 2001. 💡

❓ What does the Default option do?

📋 The “Default” option tells VOS3000 to use the corresponding system-level parameter instead of a per-phone setting. For Forward display number, the Default uses SS_CALL_FORWARD_USING_ORIGINAL_CALLER. For Normal call transfer display, it uses SS_CALL_TRANSFER_NORMAL_DISPLAY. For Ask call transfer display, it uses SS_CALL_TRANSFER_ASK_DISPLAY. These parameters are located at “Softswitch management > Additional settings > System parameter.” Default provides a global policy that can be overridden on individual phones when needed. 🔧

❓ How do I hide the original caller’s number on forwarded calls?

🔐 To hide the original caller’s number when calls are forwarded, set the “Forward display number” to “Local number” on the phone that is forwarding calls. This will display the forwarding phone’s own number instead of the original caller’s number to the called party. Alternatively, set the system parameter SS_CALL_FORWARD_USING_ORIGINAL_CALLER to show the local number by default, and it will apply to all phones using the “Default” option. 🛡️

❓ Does Display caller ID affect outbound calls?

📞 Yes. The “Display caller id” supplementary service controls whether the phone’s caller ID is shown to the called party on outbound calls. According to the VOS3000 manual, this setting “display the caller’s ID” — when enabled, the phone’s number is presented to the called party. When disabled, the caller ID may be suppressed (depending on the carrier and SIP provider configuration). The “Forward display number” and “Call transfer display” settings are specifically for forwarded and transferred calls, not for direct outbound calls. 📋

❓ Can I set different caller ID display for internal vs external forwarding?

🏢 The per-phone settings in VOS3000 apply to all forwarding/transfer scenarios for that phone — there is no built-in distinction between internal and external forwarding destinations in the display settings. However, you can use creative workarounds: configure the system parameter for your most common scenario (e.g., internal forwarding), then override individual phones that forward to external numbers with the “Local number” option to protect caller privacy on external transfers. For more on call forwarding types, see our comprehensive guide. 💡

📞 Need Professional VOS3000 Setup Support?

For professional VOS3000 installations and deployment, VOS3000 Server Rental Solution:

📱 WhatsApp: +8801911119966
🌐 Website: www.vos3000.com
🌐 Blog: multahost.com/blog
📥 Downloads: VOS3000 Downloads

VOS3000 Caller Source Header, VOS3000 Callee Source Header, VOS3000 Remote Ring Back Mode, VOS3000 Call Forward Signal Recognition, VOS3000 Replace Failed Reason

VOS3000 Caller Source Header Selection Complete From Remote-Party-ID Display Important

April 21, 2026April 21, 2026 king

VOS3000 Caller Source Header Selection Complete From Remote-Party-ID Display

Configuring VOS3000 caller source header selection determines which SIP header VOS3000 uses to extract the calling party number (CLI) from incoming calls at the mapping gateway. The three available sources — From header, Remote-Party-ID header, and Display name — each provide different caller identity information, and choosing the right one is critical for accurate caller ID presentation, correct billing rate lookups, and proper prefix matching. Misconfigured caller source selection leads to wrong CLI in CDRs, incorrect rate table matches, and caller ID presentation failures that affect both billing and user experience. Need help configuring this? Contact us on WhatsApp: +8801911119966.

In SIP signaling, the calling party identity can appear in multiple headers simultaneously, and these headers may contain different values. The From header always contains a URI with the caller number, but it may be modified by intermediate proxies. The Remote-Party-ID (RPID) header, defined in RFC 3325, provides a more trustworthy identity inserted by the network. The Display name component carries a human-readable caller label. VOS3000 lets you choose which source to trust for CLI extraction at each mapping gateway independently.

Three Caller Source Options in VOS3000

The VOS3000 mapping gateway configuration under §2.5.1.2 provides three caller source options. Each option extracts the calling number from a different part of the SIP INVITE message, and the choice affects how the CLI is used for routing, billing, and presentation downstream.

Source Option	SIP Header	What Is Extracted
From	From: <sip:number@host>	User part of the From URI (the number before @)
Remote-Party-ID	Remote-Party-ID: <sip:number@host>	User part of the RPID URI (network-trusted identity)
Display	From: “Display Name” <sip:number@host>	Display name string from the From header

When to Use Each VOS3000 Caller Source

Choosing the correct VOS3000 caller source header selection depends on your upstream carrier configuration and how caller identity is delivered in your SIP trunks. Different carriers use different headers for CLI, and using the wrong source will extract incorrect or incomplete caller information.

Scenario	Recommended Source	Reason
Standard SIP carrier trunk	From	Most carriers put CLI in From header
Carrier with RPID support	Remote-Party-ID	RPID contains network-verified CLI
From header has privacy proxy value	Remote-Party-ID	RPID has real CLI behind privacy proxy
Display name contains actual number	Display	Some PBX systems put CLI in display name
Wholesale interconnect	Remote-Party-ID or From (per carrier)	Depends on interconnect agreement

From Header Source — Detailed Behavior

When VOS3000 caller source header selection is set to From, the system extracts the user portion of the SIP URI from the From header. This is the most commonly used source because virtually all SIP implementations include the calling number in the From header. However, the From header can be modified by intermediate proxies and does not carry network-verified identity — any SIP user agent can set any value in the From header. For environments where CLI accuracy is critical, the From header alone may not be trustworthy enough.

Aspect	From Header Source
Always present	Yes — mandatory in all SIP requests
Trust level	Low — can be spoofed by caller
Format	User part of sip:user@host URI
Privacy support	May contain anonymous value when privacy requested
Best for	Simple deployments without RPID support

Remote-Party-ID Source — Detailed Behavior

The Remote-Party-ID header, defined in RFC 3325, carries the network-verified identity of the calling party. When a carrier or SIP proxy authenticates the caller, it inserts the RPID header with the verified identity, which may differ from the From header value. Setting VOS3000 caller source header selection to Remote-Party-ID tells VOS3000 to prefer this network-verified identity over the self-declared From header. This is the recommended setting when your upstream carrier provides RPID, as it ensures accurate CLI for both routing and billing. For related CLI management, see our VOS3000 caller ID management guide.

Aspect	RPID Source
Always present	No — only if carrier/proxy inserts it
Trust level	High — network-verified identity
Privacy indicator	Contains privacy=id tag for caller ID restrictions
Screen indicator	Contains screen=yes for verified identity
Best for	Wholesale interconnects with carrier CLI verification

Impact of Caller Source on Billing and Rate Lookup

The extracted caller number is not just used for display — VOS3000 also uses it for prefix matching in rate tables and routing decisions. If the wrong source is selected, the extracted CLI may be incorrect, causing rate table mismatches and billing errors. For example, if the From header contains an anonymous value but the RPID has the real number, selecting From would result in no rate match, while RPID would produce the correct billing. For billing configuration, see our VOS3000 billing system guide. For direct support, message us on WhatsApp: +8801911119966.

Caller Source	Rate Lookup Impact	CDR Recording
From (correct CLI)	Correct rate match	Accurate CDR caller number
From (anonymous/spoofed)	No rate match or wrong rate	Invalid CDR caller number
Remote-Party-ID	Correct rate match with verified CLI	Verified CDR caller number
Display (non-numeric)	Rate lookup may fail	Non-numeric CDR caller field

Frequently Asked Questions About VOS3000 Caller Source Header Selection

What is caller source header selection in VOS3000?

Caller source header selection in VOS3000 is a mapping gateway configuration that determines which SIP header the system uses to extract the calling party number. The three options are From (extracts from the standard SIP From header URI), Remote-Party-ID (extracts from the RPID header that carries network-verified identity), and Display (extracts the display name from the From header). This setting is configured per mapping gateway under §2.5.1.2 of the VOS3000 administration manual.

When should I use Remote-Party-ID instead of From?

You should use Remote-Party-ID instead of From when your upstream carrier or SIP proxy inserts the RPID header with the verified calling party identity. The From header can be set to any value by the calling party and may contain anonymous or privacy-shielded values, while RPID is inserted by the network after authentication and represents the verified identity. If your carrier provides RPID headers, using this source ensures more accurate CLI for billing rate lookups and caller ID presentation.

What happens if Remote-Party-ID is selected but not present?

If VOS3000 caller source header selection is set to Remote-Party-ID but the incoming SIP INVITE does not contain an RPID header, VOS3000 falls back to extracting the caller number from the From header. This fallback behavior ensures that calls are not rejected or misrouted simply because the RPID header is absent. However, if the From header also contains an invalid or anonymous value, the CLI extraction will produce incorrect results.

Does caller source selection affect the CDR caller number field?

Yes, the caller source selection directly determines what value appears in the CDR caller number field. If From is selected, the CDR records the number from the From header URI. If Remote-Party-ID is selected, the CDR records the network-verified number from the RPID header. This means that changing the caller source configuration can change what appears in your CDRs, which affects billing reports, dispute resolution, and regulatory compliance records.

Can I use the Display name source for caller ID extraction?

Yes, the Display source option extracts the display name string from the From header (the quoted text before the URI). However, this option should be used with caution because display names are typically free-text strings that may not contain valid phone numbers. This option is useful only when the display name field contains the actual caller number in a specific deployment where PBX systems or carriers use this convention. For most production deployments, From or Remote-Party-ID are the appropriate choices.

How does caller source interact with P-Asserted-Identity?

VOS3000 caller source header selection focuses on the From, Remote-Party-ID, and Display headers. P-Asserted-Identity (PAI) is a separate SIP header defined in RFC 3325 that also carries network-verified identity. VOS3000 has separate configuration for PAI handling, which can work alongside or independently of the caller source selection. In some configurations, the PAI header may be used for outbound caller ID presentation while the caller source setting controls inbound CLI extraction. For detailed PAI configuration, see our VOS3000 PAI guide.

Get Expert VOS3000 Caller ID Configuration

Proper VOS3000 caller source header selection is essential for accurate caller ID extraction, correct billing, and reliable routing. Misconfigured caller source settings can cause billing discrepancies, failed rate lookups, and caller ID presentation issues across your entire network.

Contact us on WhatsApp: +8801911119966

Our VOS3000 specialists can help you configure the optimal caller source settings for each mapping gateway based on your carrier agreements. Reach out today at +8801911119966 and ensure your CLI handling is accurate and reliable.

📞 Need Professional VOS3000 Setup Support?

For professional VOS3000 installations and deployment, VOS3000 Server Rental Solution:

📱 WhatsApp: +8801911119966
🌐 Website: www.vos3000.com
🌐 Blog: multahost.com/blog
📥 Downloads: VOS3000 Downloads

VOS3000 P-Asserted-Identity, VOS3000 Web Manager, VOS3000 DTMF Configuration, VOS3000 Agent Account, VOS3000 Transcoding

VOS3000 P-Asserted-Identity: Caller ID Manipulation Important Guide for VoIP

April 13, 2026April 13, 2026 king

VOS3000 P-Asserted-Identity: Caller ID Manipulation Guide for VoIP

Configuring VOS3000 P-Asserted-Identity correctly is crucial for VoIP operators who need to control how caller ID information is presented to termination providers, regulatory bodies, and end users. The P-Asserted-Identity (PAI) header, defined in RFC 3325, is the industry-standard mechanism for asserting the identity of the calling party within trusted VoIP networks. Many termination vendors require specific PAI header configuration to accept calls, and incorrect PAI settings result in calls being rejected, caller ID not displaying correctly, or compliance violations that can jeopardize your entire operation. VOS3000 P-Asserted-Identity

This guide provides a complete walkthrough of VOS3000 P-Asserted-Identity configuration, including the related Privacy and P-Preferred-Identity headers, caller dial plans, and advanced caller ID manipulation techniques. All configuration details reference the official VOS3000 V2.1.9.07 Manual. For professional assistance, contact us on WhatsApp at +8801911119966.

Understanding VOS3000 P-Asserted-Identity Header

The P-Asserted-Identity header serves a specific purpose in SIP signaling that is fundamentally different from the standard From header. While the From header identifies the caller as claimed by the caller’s device, the PAI header asserts the caller’s identity as verified by a trusted network element — in this case, your VOS3000 softswitch. This distinction is critical because termination providers rely on the PAI header to determine the actual calling party for billing, routing, and regulatory compliance purposes.

Why P-Asserted-Identity Matters for VoIP Operators

In the VOS3000 ecosystem, the PAI header impacts several critical aspects of your VoIP business. Termination vendors increasingly require PAI headers to process calls correctly, especially for emergency services and regulatory compliance. Without proper PAI configuration, your calls may be rejected by vendors or flagged as suspicious. Additionally, the PAI header determines how your customers’ caller ID appears to the called party, which affects your customers’ business credibility and call completion rates.

Key reasons to configure VOS3000 P-Asserted-Identity correctly:

Vendor requirements: Many termination providers require PAI headers to accept calls and bill correctly
Regulatory compliance: Telecom regulations in many jurisdictions require accurate caller ID presentation
Call completion: Proper PAI configuration prevents calls from being blocked by downstream providers
Emergency services: Emergency call routing depends on accurate PAI for location identification
Anti-spoofing: PAI with Privacy headers provides controlled caller ID presentation that prevents spoofing accusations

📋 Feature	🔵 From Header	🟢 PAI Header
Purpose	Caller’s claimed identity	Network-asserted identity
Trust level	Self-asserted (unverified)	Verified by trusted network
Used by vendors for billing	Sometimes	Primarily
RFC standard	RFC 3261	RFC 3325
Can include display name	Yes	Yes
Used with Privacy header	Rarely	Commonly paired

Configuring VOS3000 P-Asserted-Identity on Routing Gateway

The PAI configuration for routing gateways is located in the Additional Settings > Protocol > SIP section. Navigate to Operation Management > Gateway Operation > Routing Gateway, double-click a gateway, and access the Protocol > SIP settings (VOS3000 Manual Section 2.5.1.1, Page 43). These settings control how VOS3000 handles caller identity information when sending calls to your termination vendors.

P-Asserted-Identity Settings

VOS3000 provides three options for the PAI header on routing gateways, as documented in VOS3000 Manual Section 2.5.1.1 (Page 43):

None: The PAI header is not included in outgoing SIP messages to this gateway. Use this when the vendor does not require or expect a PAI header
Pass through: VOS3000 forwards the PAI header exactly as received from the mapping gateway (caller side). This preserves the original PAI value without modification, which is useful when the upstream device has already set the correct PAI
Caller: VOS3000 generates a new PAI header using the caller’s number. This is the most common setting because it ensures the PAI contains the correct caller ID regardless of what the caller’s device sent

For most deployments, the “Caller” option is recommended because it guarantees that the PAI header contains the actual calling number from VOS3000’s perspective. The “Pass through” option should only be used when you trust the upstream device to provide accurate PAI values. VOS3000 P-Asserted-Identity

Privacy Header Configuration

The Privacy header works in conjunction with the PAI header to control whether the caller’s identity should be hidden from the called party. According to the VOS3000 Manual (Page 43), there are three Privacy options:

None: No Privacy header is included in outgoing messages. The caller ID is presented normally
Passthrough: VOS3000 forwards the Privacy header as received from the mapping gateway. If the caller requested privacy, that request is preserved
Id: VOS3000 adds a Privacy: id header, which requests that the called party’s network hide the caller’s identity from display

The Privacy header is particularly important for regulatory compliance. In many jurisdictions, callers have the right to withhold their caller ID, and the Privacy: id header signals this request to downstream networks. When a call with Privacy: id is received, the called party’s network should suppress the caller ID display while still using the PAI header internally for billing and emergency services.

⚙️ Setting	🟢 Recommended	📝 When to Use Other Options
P-Asserted-Identity	Caller	Pass through: upstream PAI trusted; None: vendor doesn’t use PAI
Privacy	Passthrough	None: never hide caller ID; Id: always hide caller ID
P-Preferred-Identity	None	Passthrough: preserve upstream PPI; Caller: set from caller number
Caller dial plan	As needed	When vendor requires specific number format in PAI

P-Preferred-Identity Configuration

The P-Preferred-Identity (PPI) header is similar to PAI but is used in a different context. While PAI is used by networks to assert identity, PPI is used by user agents (phones, PBXs) to indicate their preferred identity. In VOS3000, the PPI options (VOS3000 Manual, Page 43) are identical to PAI:

None: No PPI header is included
Passthrough: Forward the PPI header as received from the mapping gateway
Caller: Generate a new PPI header using the caller’s number

In most VOS3000 deployments, the PPI header is set to “None” because the PAI header is the primary mechanism for identity assertion at the softswitch level. PPI is more relevant for user-agent-to-proxy communication, while PAI is for proxy-to-proxy communication. However, some vendors may require specific PPI configuration, so understanding this option is important.

VOS3000 P-Asserted-Identity Caller Dial Plan

The “Caller dial plan” setting associated with the PAI configuration allows you to transform the caller number before it is inserted into the PAI header. This is essential when your vendor requires a specific number format in the PAI header that differs from how numbers are stored in VOS3000.

Common Caller Number Transformation Scenarios

Different vendors expect different number formats in the PAI header. Here are the most common scenarios that require caller dial plan configuration:

Country code addition: Your internal numbers may not include the country code, but the vendor requires it. A dial plan can prepend the country code (e.g., +880) to the caller number in the PAI header
Leading zero removal: Some vendors require numbers without leading zeros. A dial plan can strip leading zeros from the caller number
Number format conversion: Converting between E.164 format and national format as required by the vendor
Prefix addition: Adding a specific prefix that the vendor uses to identify your traffic

🔄 Transformation	📝 Original Number	✅ PAI Number	🎯 Reason
Add country code	01712345678	+8801712345678	Vendor requires E.164
Remove leading zero	01712345678	1712345678	Vendor rejects leading 0
Add + prefix	8801712345678	+8801712345678	E.164 with plus sign
Add tech prefix	1712345678	991712345678	Vendor routing prefix

Advanced VOS3000 P-Asserted-Identity Features

Beyond the basic PAI, Privacy, and PPI settings, VOS3000 provides several advanced features that give you more control over caller identity handling.

Allow All Extra Header Fields

The “Allow all extra header fields” option (VOS3000 Manual, Page 43) enables SIP header transparency, allowing all additional header domains from the incoming SIP message to pass through to the routing gateway. When enabled, any custom or non-standard SIP headers received from the mapping gateway are forwarded unchanged. This is useful when your upstream provider sends proprietary headers that your downstream vendor expects to receive.

Allow Specified Extra Header Fields

For more granular control, the “Allow specified extra header fields” option lets you define exactly which additional header fields should be forwarded. This provides better security than allowing all headers because you can restrict passthrough to only the headers your vendor requires. Add specific header field names to the list, and only those headers will be forwarded from the incoming SIP message to the outgoing message.

Peer Number Information

The “Peer number information” setting controls which field VOS3000 uses to extract the caller number from incoming SIP signals. Available options include extracting from the From header, Display field, or Remote-Party-ID header. This setting determines the source of the caller number that may be used in the PAI header when set to “Caller” mode.

Caller Number Pool for PAI

When you need to substitute the caller ID with numbers from a pool rather than using the actual caller number, VOS3000 provides the “Enable caller number pool” feature in the routing gateway additional settings (VOS3000 Manual Section 2.5.1.1, Page 51). This feature replaces the original caller number with a number from a configured pool, which then appears in both the From header and PAI header. The number sequence can be random (0) or poll (1), configured by the FORWARD_SIGNAL_REWRITE_SEQUENCE setting in softswitch.conf. The “Multiplexes” field controls how many times each pool number can be reused concurrently.

🔧 Feature	🎯 Purpose	📍 Location
Allow all extra headers	Transparent SIP header forwarding	Gateway > Protocol > SIP
Allow specified headers	Selective header forwarding	Gateway > Protocol > SIP
Peer number information	Select caller number source field	Gateway > Protocol > SIP
Caller number pool	Substitute caller ID with pool numbers	Gateway > Additional Settings
Caller dial plan	Transform number in PAI header	Gateway > Protocol > SIP

Configuring VOS3000 P-Asserted-Identity on Mapping Gateway

The mapping gateway (customer-side) also has caller identity configuration options in the Additional Settings > Protocol > SIP section (VOS3000 Manual Section 2.5.1.2, Page 57). The mapping gateway settings control how VOS3000 handles caller identity from your customers’ devices.

Mapping Gateway Caller Settings

On the mapping gateway, the key caller identity settings include:

Caller: Determines which field of the SIP signal to extract the caller number from. Options include “From” (from the From header), “Remote-Party-ID” (from the RPID header), and “Display” (from the Display field)
Support Privacy: Enables passthrough of the mapping gateway’s privacy domain settings
Recognize call forward signal: Identifies forwarding-formatted calls for proper handling

The mapping gateway’s caller extraction method determines the initial caller number that VOS3000 uses internally. This number then flows to the routing gateway where the PAI configuration determines how it is presented to the vendor. If the mapping gateway extracts the wrong caller number, the PAI header on the routing gateway will also be wrong.

Troubleshooting VOS3000 P-Asserted-Identity Issues

PAI configuration problems can be difficult to diagnose because the SIP headers are not visible in the VOS3000 client interface. Here are the most common issues and how to resolve them.

Issue 1: Vendor Rejects Calls Due to Missing PAI

If your vendor requires the PAI header but you have it set to “None” on the routing gateway, calls will be rejected. The fix is straightforward: change the PAI setting to “Caller” so VOS3000 generates the PAI header with the caller’s number. Some vendors may also require the number in a specific format, which you can achieve with the Caller dial plan setting.

Issue 2: Wrong Number in PAI Header

If the PAI header contains an incorrect number, check the chain of caller number extraction. Start with the mapping gateway’s Caller setting to verify the correct source field is being used. Then check if any dial plans on the mapping gateway are transforming the number before it reaches the routing gateway. Finally, verify the Caller dial plan on the routing gateway’s PAI configuration is applying the correct transformation.

Issue 3: Caller ID Displayed When Privacy Is Requested

If a caller requests privacy but their number is still displayed to the called party, check that the Privacy setting on the routing gateway is not set to “None”. It should be “Passthrough” to honor the caller’s privacy request, or “Id” to always add the privacy header. Also verify that the mapping gateway’s “Support Privacy” option is enabled so that privacy requests from the caller’s device are forwarded.

⚠️ Problem	🔍 Likely Cause	✅ Solution
Vendor rejects calls	PAI set to None	Change PAI to Caller
Wrong number in PAI	Dial plan misconfiguration	Check caller extraction and dial plans
Privacy not honored	Privacy set to None	Set Privacy to Passthrough or Id
PAI missing country code	No caller dial plan	Add dial plan to prepend country code
Custom headers lost	Extra headers not allowed	Enable allow all/specified extra headers

Best Practices for VOS3000 P-Asserted-Identity Configuration

Following these best practices ensures your VOS3000 P-Asserted-Identity configuration works correctly and complies with industry standards.

PAI Configuration by Vendor Type

🏢 Vendor Type	⚙️ PAI Setting	🔒 Privacy	📝 Notes
Standard SIP trunk	Caller	Passthrough	Most common configuration
Legacy H323 gateway	None	None	H323 does not use PAI
Emergency services	Caller	None	Must always show caller ID
Privacy-required route	Caller	Id	Always hide caller ID display

Testing PAI Configuration

After configuring VOS3000 P-Asserted-Identity, test with actual calls to verify the headers are being set correctly. Use a SIP phone or softphone to place a test call and examine the SIP messages at the vendor’s side. Verify that the PAI header contains the correct number in the expected format, and that the Privacy header is present when required. For detailed call testing instructions, see our VOS3000 call test and troubleshooting guide.

Frequently Asked Questions About VOS3000 P-Asserted-Identity

❓ What is the difference between PAI and P-Preferred-Identity in VOS3000?

P-Asserted-Identity (PAI) is used by network servers (like VOS3000) to assert the identity of the calling party to other trusted network elements. P-Preferred-Identity (PPI) is used by user agents (like SIP phones) to indicate their preferred identity to the network. In VOS3000, PAI is the primary header for caller ID presentation to vendors, while PPI is rarely needed and is typically set to “None” in most deployments.

❓ Should I set PAI to “Passthrough” or “Caller”?

Use “Caller” in most cases because it ensures VOS3000 generates the PAI header from the verified caller number in its database. Use “Passthrough” only when you fully trust the upstream device to provide accurate PAI values and you want to preserve them unchanged. The risk with “Passthrough” is that incorrect or spoofed PAI values from the upstream could be forwarded to your vendor.

❓ Why does my vendor require a specific number format in the PAI header?

Vendors use the PAI header for billing, routing, and regulatory compliance. They need the number in a consistent format (usually E.164 with country code and plus sign) to correctly identify the calling party and apply the appropriate rates. Use the Caller dial plan on the routing gateway to transform the number into the format your vendor requires.

❓ How do I hide caller ID using VOS3000 P-Asserted-Identity?

Set the Privacy option to “Id” on the routing gateway to add a Privacy: id header to all outgoing calls. This signals to the called party’s network that the caller’s identity should be hidden from display. Note that the PAI header is still included (for billing and emergency purposes), but the called party’s device should not show the caller ID to the end user.

❓ Can I set different PAI configurations for different vendors?

Yes, each routing gateway in VOS3000 has its own independent PAI configuration. This means you can configure one vendor with PAI set to “Caller” and a specific dial plan, while another vendor uses “Passthrough” or “None”. This flexibility is essential when working with multiple vendors that have different caller ID requirements.

❓ Where can I get professional help with VOS3000 PAI configuration?

Our VOS3000 specialists can configure PAI headers, dial plans, and privacy settings for your specific vendor requirements. Contact us on WhatsApp at +8801911119966 for expert assistance with your VOS3000 caller ID configuration.

Configure Your VOS3000 Caller ID with Expert Help

Proper VOS3000 P-Asserted-Identity configuration ensures that your calls are accepted by vendors, comply with regulations, and present the correct caller ID to end users. The configuration options are powerful but require careful setup to work correctly across all your vendor relationships.

📱 Contact us on WhatsApp: +8801911119966

Our team provides complete VOS3000 caller ID configuration services, from PAI header setup to dial plan optimization and privacy configuration. We can help you ensure that your caller ID is correctly presented to every vendor in your routing infrastructure.

📞 Need Professional VOS3000 Setup Support?

For professional VOS3000 installations and deployment, VOS3000 Server Rental Solution:

📱 WhatsApp: +8801911119966
🌐 Website: www.vos3000.com
🌐 Blog: multahost.com/blog
📥 Downloads: VOS3000 Downloads

VOS3000 Display Caller ID Forwarding: Flexible Number Presentation Control

Table of Contents

🔐 What Is VOS3000 Display Caller ID Forwarding?

🎯 Why VOS3000 Display Caller ID Forwarding Matters

⚙️ Forward Display Number — Three Options Explained

📋 Call Transfer Display — Normal and Ask Transfer

🔗 System Parameters for Default Caller ID Behavior

🛡️ Common VOS3000 Display Caller ID Problems and Solutions

❌ Problem 1: Forwarded Calls Show Wrong Number

❌ Problem 2: Caller ID Privacy Breach on Transferred Calls

❌ Problem 3: Display Caller ID Toggle Not Working

📊 VOS3000 Display Caller ID Configuration Checklist

❓ Frequently Asked Questions

❓ What is VOS3000 display caller ID forwarding?

❓ What is the difference between Original caller and Local number?

❓ What does the Default option do?

❓ How do I hide the original caller’s number on forwarded calls?

❓ Does Display caller ID affect outbound calls?

❓ Can I set different caller ID display for internal vs external forwarding?

📞 Need Professional VOS3000 Setup Support?

VOS3000 Caller Source Header Selection Complete From Remote-Party-ID Display

Table of Contents

Three Caller Source Options in VOS3000

When to Use Each VOS3000 Caller Source

From Header Source — Detailed Behavior

Remote-Party-ID Source — Detailed Behavior

Impact of Caller Source on Billing and Rate Lookup

Related Resources – VOS3000 Caller Source

Frequently Asked Questions About VOS3000 Caller Source Header Selection

What is caller source header selection in VOS3000?

When should I use Remote-Party-ID instead of From?

What happens if Remote-Party-ID is selected but not present?

Does caller source selection affect the CDR caller number field?

Can I use the Display name source for caller ID extraction?

How does caller source interact with P-Asserted-Identity?

Get Expert VOS3000 Caller ID Configuration

📞 Need Professional VOS3000 Setup Support?

VOS3000 P-Asserted-Identity: Caller ID Manipulation Guide for VoIP

Table of Contents

Understanding VOS3000 P-Asserted-Identity Header

Why P-Asserted-Identity Matters for VoIP Operators

Configuring VOS3000 P-Asserted-Identity on Routing Gateway

P-Asserted-Identity Settings

Privacy Header Configuration

P-Preferred-Identity Configuration

VOS3000 P-Asserted-Identity Caller Dial Plan

Common Caller Number Transformation Scenarios

Advanced VOS3000 P-Asserted-Identity Features

Allow All Extra Header Fields

Allow Specified Extra Header Fields

Peer Number Information

Caller Number Pool for PAI

Configuring VOS3000 P-Asserted-Identity on Mapping Gateway

Mapping Gateway Caller Settings

Troubleshooting VOS3000 P-Asserted-Identity Issues

Issue 1: Vendor Rejects Calls Due to Missing PAI

Issue 2: Wrong Number in PAI Header

Issue 3: Caller ID Displayed When Privacy Is Requested

Best Practices for VOS3000 P-Asserted-Identity Configuration

PAI Configuration by Vendor Type

Testing PAI Configuration

🔗 Related Resources – VOS3000 P-Asserted-Identity

Frequently Asked Questions About VOS3000 P-Asserted-Identity

❓ What is the difference between PAI and P-Preferred-Identity in VOS3000?

❓ Should I set PAI to “Passthrough” or “Caller”?

❓ Why does my vendor require a specific number format in the PAI header?

❓ How do I hide caller ID using VOS3000 P-Asserted-Identity?

❓ Can I set different PAI configurations for different vendors?

❓ Where can I get professional help with VOS3000 PAI configuration?

Configure Your VOS3000 Caller ID with Expert Help

📞 Need Professional VOS3000 Setup Support?