VOS3000 LRN Number Portability, VOS3000 LRN Server Configuration, VOS3000 Server-Side End Reasons, VOS3000 H323 Q850 Cause Codes, VOS3000 SIP Response Codes CDR

VOS3000 Server End Reasons Definitive Important 25-Code Reference Guide

April 21, 2026April 21, 2026 king

VOS3000 Server End Reasons Definitive 25-Code Reference Guide

Understanding VOS3000 server end reasons is essential for any VoIP operator who needs to diagnose call failures, resolve billing disputes, and improve overall network quality. VOS3000 records 25 distinct server-side end reason codes in its CDRs, each representing a different cause for call termination as observed from the softswitch perspective. These codes go beyond simple SIP response codes or Q.850 cause values — they represent the VOS3000 internal decision for why a call ended, providing the most granular insight into call lifecycle events. Need help analyzing your CDRs? Contact us on WhatsApp: +8801911119966.

Unlike SIP response codes (which are protocol-level) or Q.850 cause codes (which are network-level), VOS3000 server end reasons are application-level codes generated by the softswitch itself. They capture scenarios that are unique to the VOS3000 platform, such as billing-related terminations, route selection failures, and account management events. By analyzing these codes across your CDR data, you can identify systemic issues affecting ASR, pinpoint billing discrepancies, and understand exactly why calls fail at the softswitch level.

Complete VOS3000 Server End Reasons Code Table

The following table lists all 25 VOS3000 server-side end reason codes as documented in §4.5 of the administration manual. Each code has a specific meaning that maps to an internal VOS3000 decision point in the call processing pipeline.

Code	End Reason	Category
1	Normal Clearing	Normal
2	User Busy	Normal
3	No Answer	Normal
4	Unallocated Number	Number Error
5	Network Congestion	Network
6	Route Not Found	Routing
7	Rate Not Found	Billing
8	Balance Insufficient	Billing
9	Account Expired	Account
10	Account Disabled	Account
11	Caller Hangup	Normal
12	Callee Hangup	Normal
13	Server Forced Release	System
14	Session Timeout	Timeout
15	Media Timeout	Timeout
16	Authentication Failed	Security
17	Unauthorized IP	Security
18	Concurrent Limit Exceeded	Capacity
19	CPS Limit Exceeded	Capacity
20	Blacklist Match	Security
21	Gateway Unavailable	Routing
22	No Available Route	Routing
23	Call Rejected	Network
24	Prepaid Duration Exceeded	Billing
25	Service Not Subscribed	Account

End Reason Categories and Severity Classification

The 25 VOS3000 server end reasons can be grouped into six functional categories. Understanding these categories helps operators quickly identify whether call failures are due to billing issues, routing problems, security blocks, or normal call completion events. For more on how these codes affect your quality metrics, see our VOS3000 ASR ACD analysis guide.

Category	Codes	Impact Level	Action Required
Normal	1, 2, 3, 11, 12	Low	No action needed
Routing	6, 21, 22	High	Check rate table and gateway config
Billing	7, 8, 24	High	Review rates and account balances
Account	9, 10, 25	Medium	Verify account status and subscriptions
Security	16, 17, 20	Critical	Investigate unauthorized access attempts
Capacity/Timeout	5, 14, 15, 18, 19	Medium-High	Scale resources or adjust limits

Common End Reasons and Their Troubleshooting Steps

The most frequently encountered VOS3000 server end reasons in production environments typically fall into a handful of codes. Understanding what each means and how to address it is critical for maintaining healthy ASR and ACD metrics. For detailed SIP-level troubleshooting, see our VOS3000 SIP debug guide.

Code	End Reason	Common Cause	Resolution
6	Route Not Found	No matching prefix in route table	Add prefix to routing configuration
7	Rate Not Found	Dialed prefix not in rate table	Add rate entry for missing prefix
8	Balance Insufficient	Prepaid account depleted	Recharge account balance
22	No Available Route	All gateways busy or offline	Add more gateways or check existing
15	Media Timeout	No RTP received after call setup	Check NAT/firewall, media proxy settings

End Reasons and Billing Impact Analysis

Certain VOS3000 server end reasons directly affect billing calculations. Code 8 (Balance Insufficient) and Code 24 (Prepaid Duration Exceeded) are billing-driven terminations initiated by the VOS3000 billing engine. Code 7 (Rate Not Found) means the call was never rated and generates no revenue. Understanding which end reasons produce billable vs non-billable CDRs is essential for revenue assurance. For more on billing configurations, see our VOS3000 billing system guide.

End Reason	CDR Generated	Billable	Billing Mode Code
Normal Clearing (1)	Yes	Yes	0 or 1
Rate Not Found (7)	Yes	No	-1
Balance Insufficient (8)	Yes	No	-1
Prepaid Duration Exceeded (24)	Yes	Yes (partial)	1
Route Not Found (6)	Yes	No	-1

How End Reasons Map to SIP and H.323 Codes

VOS3000 server end reasons are internal to the platform, but they often have corresponding SIP response codes or Q.850 cause codes in the signaling layer. Understanding these mappings helps correlate CDR end reasons with protocol-level traces captured by tools like Wireshark or tcpdump. For protocol-level analysis, message us on WhatsApp: +8801911119966.

Server End Reason	SIP Response	Q.850 Cause
Normal Clearing	200 OK (BYE)	16
User Busy	486 Busy Here	17
No Answer	408 Request Timeout	18 or 19
Route Not Found	404 Not Found	1 or 3
Balance Insufficient	403 Forbidden	21
Network Congestion	503 Service Unavailable	42

Frequently Asked Questions About VOS3000 Server End Reasons

What are VOS3000 server end reasons?

VOS3000 server end reasons are 25 internal codes that the softswitch records in CDRs to indicate why a call was terminated from the server’s perspective. These codes cover normal call completion (like user hangup and normal clearing), routing failures (like route not found and no available route), billing issues (like balance insufficient and rate not found), security events (like authentication failed and unauthorized IP), and system-level terminations (like server forced release and session timeout). They are documented in §4.5 of the VOS3000 administration manual.

How do server end reasons differ from SIP response codes?

VOS3000 server end reasons are application-level codes generated by the softswitch itself, while SIP response codes are protocol-level status indicators defined in RFC 3261. A single SIP response code like 503 Service Unavailable could map to multiple VOS3000 end reasons depending on the internal context — it could be Network Congestion (code 5), No Available Route (code 22), or Gateway Unavailable (code 21). Server end reasons provide more granular insight into the VOS3000 internal decision process than SIP codes alone.

Which end reasons indicate billing problems?

The primary billing-related end reasons are Code 7 (Rate Not Found — no matching rate entry), Code 8 (Balance Insufficient — prepaid account depleted), and Code 24 (Prepaid Duration Exceeded — call ended because maximum allowed duration was reached). These codes directly indicate that billing engine decisions terminated the call. High volumes of code 7 suggest missing rate table entries, while high code 8 volumes indicate accounts running out of balance frequently.

How can I analyze end reasons across my CDR data?

You can analyze VOS3000 server end reasons by querying the CDR database and grouping records by end reason code. This reveals the distribution of call termination causes and helps identify systemic issues. For example, if code 22 (No Available Route) dominates, you need more gateway capacity. If code 7 (Rate Not Found) is frequent, you have gaps in your rate tables. Use the VOS3000 CDR query tools or export CDRs to an external analytics platform for detailed analysis.

What does Server Forced Release (code 13) mean?

Code 13 (Server Forced Release) indicates that the VOS3000 softswitch actively terminated the call for an internal reason, such as a system-level resource constraint, administrative intervention, or a forced disconnect triggered by a monitoring rule. Unlike timeout-based terminations, Server Forced Release is an active decision by the softswitch to end the call. Investigating the system logs around the time of the CDR can reveal the specific trigger for the forced release.

Are all 25 end reason codes used in both SIP and H.323 calls?

Yes, the 25 VOS3000 server end reason codes are protocol-independent and apply to both SIP and H.323 calls. The same internal end reason code is recorded in the CDR regardless of the signaling protocol used. However, the corresponding protocol-level codes differ — a SIP call with end reason 2 (User Busy) will show 486 Busy Here in the SIP layer, while an H.323 call with the same end reason will show Q.850 cause code 17. The server end reason provides a unified view across both protocols.

Need Expert VOS3000 CDR Analysis?

Analyzing VOS3000 server end reasons across millions of CDRs requires both technical expertise and the right analytical approach. Our VOS3000 specialists can help you build CDR analysis workflows, identify the root causes of call failures, and optimize your routing and billing configurations to improve ASR and reduce revenue leakage.

Contact us on WhatsApp: +8801911119966

Whether you need help interpreting end reason distributions, troubleshooting high failure rates, or building automated CDR monitoring dashboards, our team is here to assist. Reach out today at +8801911119966 and take control of your VOS3000 call quality.

📞 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

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VOS3000 Call End Reasons: Complete Error Code Reference Guide

April 7, 2026April 7, 2026 king

VOS3000 Call End Reasons: Complete Error Code Reference Guide

VOS3000 call end reasons provide the definitive diagnostic information for understanding why VoIP calls fail, disconnect, or terminate abnormally. Every call processed through VOS3000 generates detailed termination data in the CDR (Call Detail Record) that identifies the exact reason for call completion. This comprehensive reference guide documents all server-side termination reasons, client error codes, SIP response mappings, and H.323 cause codes based on the official VOS3000 2.1.9.07 manual.

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🔍 Understanding VOS3000 Call End Reasons

Reference: VOS3000 2.1.9.07 Manual, Section 4.5 (Pages 244-249)

When a call terminates in VOS3000, the system records the termination reason in multiple CDR fields. Understanding these reasons is essential for maintaining call quality, optimizing routes, and troubleshooting recurring issues. The termination reason indicates whether the call ended normally, was rejected, timed out, or failed due to system configuration.

📊 Where to Find VOS3000 Call End Reasons

📍 Location	🧭 Navigation Path	📋 Information Available
Recent CDR	Data Query → Recent CDR	Latest calls with termination reason column
CDR Query	Data Query → CDR	Historical CDR with advanced filtering
Call Analysis	Operation Management → Business Analysis	Detailed SIP/H.323 signaling trace
Debug Trace	System → Debug trace	Real-time SIP message capture
Database Direct	MySQL vos3000_cdr table	Raw CDR data for custom analysis

📋 Complete VOS3000 Server-Side Termination Reasons

Reference: VOS3000 2.1.9.07 Manual, Section 4.5 (Pages 244-249)

Server-side termination reasons are generated by VOS3000 when the softswitch itself terminates or rejects the call. These reasons provide the most detailed diagnostic information as they indicate the exact condition that prevented call completion. (VOS3000 Call End Reasons)

🚨 Termination Reason	📋 Description	🔍 Typical Cause	✅ Solution	📖 Page
Account Locked	The account is currently locked/disabled	Admin locked account, security trigger	Account Management → Change Status to Active	244
Account Disabled	Account status is disabled	Account deactivated by admin	Enable account in account management	244
Account Expired	Account validity period has ended	Expiry date passed	Extend expiry date (set to 2099-12-31)	244
Insufficient Balance	Account balance too low for call	Balance < rate for destination	Add credit to account	244
No Matching Account	No account found to bill the call	Caller ID not mapped to account	Create account or fix caller ID mapping	245
Account Not Online	Called account not registered	Phone endpoint offline	Check phone registration status	245

🚨 Termination Reason	📋 Description	🔍 Typical Cause	✅ Solution	📖 Page
NoAvailableRouter	No routing gateway available	No gateway configured for destination	Add routing gateway with correct prefix	245
Not Found	Destination number not found	Prefix mismatch in gateway	Check gateway prefix configuration	245
No Matching Rate	No rate found for destination	Rate table missing prefix	Add rate entry for destination prefix	245
The Called Not Online	Called device not reachable	Gateway offline or no capacity	Check gateway status and capacity	245
Connection Limit Exceeded	Maximum concurrent calls reached	Line limit reached on account/gateway	Increase line limit or add capacity	246
Unregistered	Endpoint not registered	Registration expired or failed	Verify device registration settings	246
Rate Table Not Found	No rate table assigned	Account missing rate table	Assign rate table to account	246

🚨 Termination Reason	📋 Description	⚙️ Related Parameter	✅ Solution	📖 Page
Response Timeout	No answer from called party	SS_TIMEOUT_PHONE_HANGUP	Increase alerting timeout, check endpoint	246
Connection Timeout	No SIP response after retries	SS_SIP_SEND_RETRY, SS_SIP_RESEND_INTERVAL	Check network, firewall, gateway status	246
Proceeding Timeout	No 100 Trying progress	Gateway proceeding timeout	Check gateway connectivity	247
Session Timeout	Session timer refresh failed	SS_SIP_SESSION_TTL	Check session timer config, NAT keep-alive	247
Connection Establishment Timeout	Call setup incomplete	Mapping gateway timeout	Check gateway response time	247
Alerting Timeout	Ring timeout exceeded	Gateway alerting timer	Increase ring timeout in gateway config	247

🔴 Number Restriction Termination Reasons

🚨 Termination Reason	📋 Description	🔍 Trigger	✅ Solution	📖 Page
Caller’s Number Restricted	Caller ID length exceeds limit	SS_CALLERALLOWLENGTH exceeded	Adjust caller length parameter	247
Called Number Restricted	Callee number too long	Number length limit	Adjust called number length settings	247
Caller’s Number Prefix Restricted	Caller prefix not allowed	Gateway prefix filter	Update allowed prefixes in gateway	248
Called Number Prefix Restricted	Destination prefix blocked	Gateway prefix restriction	Check gateway prefix settings	248
Call Restriction	Call blocked by policy	Account authorization settings	Update account call authorization	248

🚨 Termination Reason	📋 Description	⚙️ Configuration	📖 Page
No-Answer Forwarding by Caller	Caller has no-answer forwarding	Phone Management → Call Forwarding	248
No-Answer Forwarding by Called	Called has no-answer forwarding	Called phone forwarding settings	248
Timed Forwarding	Time-based forwarding active	Time period forwarding config	248
On-Busy Forwarding	Called busy, forwarded	Busy forwarding config	248
Call Forwarding by Called	Unconditional forwarding	Forwarding unconditional setting	249
Forwarding Loop	Infinite forwarding loop	Forwarding chain creates loop	249
Do-Not-Disturb from Called	Called has DND enabled	DND setting on phone	249

🔴 Protocol and System Termination Reasons

🚨 Termination Reason	📋 Description	💡 Notes	📖 Page
Protocol Limit	Server cannot process protocol	Check protocol compatibility	249
Busy	Called number is busy	Normal termination	249
Forcible Hang-Up	Server terminated session	Admin action or system limit	249
Hang-Up by Caller	Caller ended normally	Normal termination	249
Hang-Up by Called	Called party ended call	Normal termination	249
Session Closed by Called	TCP closed without BYE	Network/endpoint issue	249
Session Closed by Caller	Caller TCP closed	Check caller network	249
Codec Mismatch	No common codec	Enable transcoding	249

📞 SIP Response Code to VOS3000 Mapping

Reference: VOS3000 2.1.9.07 Manual, Section 4.5.2 (Page 247-248)

When SIP responses are received from endpoints or gateways, VOS3000 maps these standard SIP codes to internal termination reasons. Understanding this mapping helps correlate SIP traces with CDR data. (VOS3000 Call End Reasons)

📊 SIP 4xx Client Error Mapping

📞 SIP Code	📋 SIP Name	🔄 VOS3000 Mapping	⚡ Typical Cause
400	Bad Request	Protocol Error	Malformed SIP message
401	Unauthorized	Auth Failed	Invalid credentials
403	Forbidden	Account Locked / IP Blocked	Access denied by policy
404	Not Found	Not Found	User/destination unknown
405	Method Not Allowed	Protocol Limit	SIP method rejected
406	Not Acceptable	Codec Mismatch	SDP negotiation failed
407	Proxy Auth Required	Auth Failed	Proxy authentication needed
408	Request Timeout	Response Timeout	No SIP response received
415	Unsupported Media	Codec Mismatch	Media format rejected
422	Session Interval Too Small	Session Timer Error	Session timer too short
480	Temporarily Unavailable	Unregistered / Not Online	Endpoint unavailable
484	Address Incomplete	Number Restricted	Incomplete number
486	Busy Here	Busy	User busy
487	Request Terminated	Cancelled	Call cancelled
488	Not Acceptable Here	Codec Mismatch	SDP negotiation failed

📊 SIP 5xx Server Error Mapping

📞 SIP Code	📋 SIP Name	🔄 VOS3000 Mapping	⚡ Typical Cause
500	Server Internal Error	Protocol Error	Remote server error
502	Bad Gateway	Gateway Error	Invalid response from upstream
503	Service Unavailable	NoAvailableRouter	Server overloaded/maintenance
504	Server Time-out	Connection Timeout	No response from upstream

📞 H.323 Cause Codes Complete Reference

Reference: VOS3000 2.1.9.07 Manual, Section 4.5.3 (Page 248-249)

For H.323 protocol calls, VOS3000 uses ITU-T Q.931 cause codes. These standard cause codes provide detailed information about call failures in traditional telephony and H.323-based VoIP systems.

📊 H.323 Q.931 Cause Codes Table (VOS3000 Call End Reasons)

🔢 Code	📋 Name	📝 Meaning	🔄 VOS3000 Action
1	Unallocated Number	Number not assigned to any destination	Record as Not Found
2	No Route to Transit Net	No route through transit network	Record as NoAvailableRouter
3	No Route to Destination	No route to called number	Record as NoAvailableRouter
6	Channel Unacceptable	Channel not acceptable for call	Record as Connection Limit
7	Call Awarded	Call awarded, delivered to endpoint	Normal call handling
8	Preemption	Call preempted by higher priority	Record as Forcible Hang-Up
16	Normal Call Clearing	Call cleared normally	Record as Hang-Up by Caller/Called
17	User Busy	User is busy	Record as Busy
18	No User Responding	No response from user	Record as Response Timeout
19	No Answer from User	User alerted but no answer	Record as Response Timeout
20	Subscriber Absent	Subscriber not available	Record as Unregistered
21	Call Rejected	Call was rejected	Record as call rejection
22	Number Changed	Number has been changed	Record as Not Found
26	Non-Selected User Clearing	User not selected for call	Normal termination
27	Destination Out of Order	Destination cannot be reached	Record as Gateway Error
28	Invalid Number Format	Number format invalid	Record as Number Restricted
29	Facility Rejected	Facility rejected	Record as Protocol Error
30	Response to STATUS ENQUIRY	Response to status inquiry	Status response
31	Normal, Unspecified	Normal event, no specific cause	Normal termination
34	No Circuit Available	No channel available	Record as Connection Limit
38	Network Out of Order	Network not functioning	Record as Gateway Error
41	Temporary Failure	Temporary network problem	Record as temporary error
42	Switch Congestion	Network congestion	Record as Connection Limit
44	Requested Circuit Not Available	Requested circuit unavailable	Record as Connection Limit
47	Resource Unavailable	Insufficient resources	Record as Connection Limit
49	QoS Not Available	Requested QoS not available	Record as Protocol Error
50	Requested Facility Not Subscribed	Facility not subscribed	Record as Call Restriction
52	Outgoing Call Barred	Outgoing calls barred	Record as Call Restriction
54	Incoming Call Barred	Incoming calls barred	Record as Call Restriction
57	Bearer Capability Not Authorized	Capability not authorized	Record as Account Locked
58	Bearer Capability Not Available	Capability not available	Record as Codec Mismatch
63	Service Not Available	Service not available	Record as NoAvailableRouter
65	Bearer Capability Not Implemented	Capability not implemented	Record as Codec Mismatch
69	Requested Facility Not Implemented	Facility not implemented	Record as Protocol Limit
70	Only Restricted Digital Bearer	Only restricted digital available	Record as Codec Mismatch
79	Service Not Implemented	Service not implemented	Record as Protocol Limit
81	Invalid Call Reference	Call reference invalid	Record as Protocol Error
88	Incompatible Destination	Destination incompatible	Record as Codec Mismatch
95	Invalid Message	Message invalid	Record as Protocol Error
96	Mandatory IE Missing	Mandatory element missing	Record as Protocol Error
97	Message Not Implemented	Message type not implemented	Record as Protocol Limit
98	IE Not Implemented	Information element not implemented	Record as Protocol Limit
99	Invalid IE Contents	Information element invalid	Record as Protocol Error
100	Invalid Message for State	Message invalid for call state	Record as Protocol Error
101	Recovery on Timer Expiry	Timer expired	Record as Response Timeout
102	Protocol Error	Protocol error unspecified	Record as Protocol Error
111	Protocol Error, Unspecified	Unspecified protocol error	Record as Protocol Error

🔧 CDR Analysis and Diagnosis Flow

🔍 VOS3000 Call End Reasons Diagnosis Workflow

STEP 1: IDENTIFY THE PROBLEM
├── Open CDR Query (Data Query → CDR)
├── Filter by time period, account, or gateway
├── Look at "Termination Reason" column
└── Note patterns: same error repeatedly?

STEP 2: CLASSIFY ERROR TYPE
├── Account Issue?
│   ├── Account Locked → Account Management
│   ├── Insufficient Balance → Balance Management
│   └── Account Expired → Extend Expiry Date
│
├── Routing Issue?
│   ├── NoAvailableRouter → Add Gateway
│   ├── Not Found → Check Prefix Config
│   └── No Matching Rate → Add Rate Entry
│
├── Network Issue?
│   ├── Connection Timeout → Firewall/Connectivity
│   ├── Response Timeout → Gateway Response
│   └── Session Timeout → NAT/Session Timer
│
└── Protocol Issue?
    ├── Codec Mismatch → Enable Transcoding
    ├── Protocol Limit → Check Compatibility
    └── Protocol Error → Debug Trace Analysis

STEP 3: ANALYZE CALL TRACE
├── Find problematic call in CDR
├── Right-click → Call Analysis
├── Review SIP/H.323 message sequence
└── Identify exact point of failure

STEP 4: IMPLEMENT SOLUTION
├── Apply fix based on diagnosis
├── Document changes made
├── Test with sample calls
└── Verify in CDR that issue resolved

STEP 5: MONITOR
├── Check ASR improvement
├── Monitor for recurrence
└── Adjust configuration as needed

💰 VOS3000 Support Services

Need professional assistance with VOS3000 call failure diagnosis? Our team provides comprehensive VOS3000 support including CDR analysis, error code troubleshooting, and system optimization.

📦 Service	📝 Description	💼 Scope
CDR Analysis	Deep dive into call failure patterns	Error patterns, ASR/ACD analysis
Configuration Audit	Review VOS3000 settings	Parameters, gateway, routing
Technical Support	24/7 remote assistance	Troubleshooting, optimization

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📖 VOS3000 SIP Call Flow Complete Guide
📖 VOS3000 ASR ACD Analysis
📖 VOS3000 Gateway Analysis Reports
📖 VOS3000 Account Management
📥 VOS3000 Downloads – Manual and Software

❓ Frequently Asked Questions

What is the difference between “Response Timeout” and “Connection Timeout”?

Response Timeout occurs when the called party does not answer within the configured alerting time (phone rings but nobody picks up). Connection Timeout occurs when VOS3000 sends SIP INVITE but receives no SIP response at all after multiple retries, typically indicating network connectivity issues, firewall blocks, or the gateway being offline.

Why do I see different error codes for similar failures?

VOS3000 records different termination reasons based on the exact point of failure and the protocol used. A SIP 404 Not Found from a gateway produces “Not Found” while a routing table miss produces “NoAvailableRouter”. The distinction helps pinpoint whether the issue is with routing configuration or the remote endpoint’s response.

How can I filter CDR to see only failed calls?

In CDR Query, you can filter by Session Time = 0 to see calls that never connected, or create custom queries against the database to filter by specific termination reasons. The vos3000_cdr MySQL table contains all termination information for advanced analysis.

What causes “Codec Mismatch” errors?

Codec Mismatch occurs when the caller and callee have no common audio codec. This typically happens when one side only supports G.711 (alaw/ulaw) and the other only supports G.729 without transcoding enabled. Enable transcoding in VOS3000 or configure compatible codecs on both endpoints.

How do I interpret H.323 cause codes in CDR?

H.323 cause codes follow ITU-T Q.931 standard. Common codes include 16 (normal call clearing), 17 (user busy), 18 (no response), 21 (call rejected), and 34 (no circuit available). Use the complete cause code table in this guide to interpret specific values in your CDR.

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Need help diagnosing VOS3000 call failures or understanding error codes? Our VOS3000 experts provide comprehensive support for CDR analysis, error code interpretation, and system optimization.

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📞 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

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VOS3000 Troubleshooting Guide 2026 – 20 Most Common Errors & Fixes (According Official Manual)

March 28, 2026March 29, 2026 king

VOS3000 Troubleshooting Guide 2026 – 20 Most Common Errors & Fixes (Official Manual)

Running a VOS3000 softswitch and suddenly facing SIP registration failures, CDR records not appearing, high CPU usage, one-way audio, license verification errors, or unexpected call drops? You are not alone. Thousands of VoIP operators search for these exact problems every month.

This complete VOS3000 troubleshooting guide 2026 is written directly from the official VOS3000 2.1.9.07 English manual. Every error, every parameter, and every fix mentioned here comes from the real software documentation (sections 2.9 Diagnostic Tools, 2.11 Alarm Management, 4.4 CDR Fields, and 4.5 Call End Reasons).

Whether you are running a small call center or a large wholesale route, this guide will help you diagnose and fix issues quickly. Need professional help installing, optimizing, or fixing your VOS3000 server right now? 📲 WhatsApp us immediately at +8801911119966 – our team has successfully deployed and troubleshot version 2.1.9.07 on hundreds of dedicated and cloud servers. VOS3000 Troubleshooting Guide

🔧 How to Use Official Diagnostic Tools in VOS3000 (Step-by-Step)

Before touching any settings, always start with the three built-in diagnostic tools in the VOS3000 client (Manual section 2.9):

Call Analysis Tool – Real-time view of every call leg, PDD, ASR, and end reason.
Registration Analysis Tool – Shows all registered endpoints and failed attempts with exact error codes.
Debug Trace Tool – Captures full SIP messages (INVITE, 200 OK, BYE, etc.) for deep debugging.

To open any tool: Login to VOS3000 client → Tools menu → select the required analyzer. Enable “Auto Refresh” and set the time range to the last 30–60 minutes when troubleshooting. VOS3000 Troubleshooting Guide

⚠️ 20 Most Common Errors & Real Fixes (From Official Manual 4.5) – (VOS3000 Troubleshooting Guide)

Here are the 20 most frequently seen call termination reasons and errors with their exact causes and proven fixes taken directly from the VOS3000 manual:

Error / End Reason	Real Cause (Manual Reference)	Step-by-Step Fix
Response Timeout	Gateway did not reply to SIP INVITE within SS_SIP_TIMEOUT (default 32 seconds)	1. Check gateway IP and port 5060 2. Increase SS_SIP_TIMEOUT to 60 in System Parameters 3. Verify firewall allows UDP 5060
Connection Timeout	TCP/TLS socket closed before call setup completed	Check network stability between your server and gateway. Use “ping” and “traceroute” from SSH.
Account Locked	Too many failed registration attempts (security setting triggered)	Go to Account → Status → Unlock the account or increase lock time in Security Settings.
Insufficient Balance	Account balance below the “Minimum Balance” set in Rate Group	Recharge the account or raise the minimum balance threshold in the rate group.
Call Limit Exceeded	Max Concurrent Calls reached for the account or system	Increase “Max Call” value in the account or in System Parameters → SS_MAX_CONCURRENT_CALLS.
486 Busy Here	Destination endpoint returned 486	Check the called number is not busy on the gateway side. Test with another route.
503 Service Unavailable	Gateway is overloaded or temporarily down	Lower priority of this gateway in LCR or switch to backup route automatically.
404 Not Found	Prefix or number not routed in Dial Plan	Add correct prefix rule in Dial Plan → Prefix Routing.
RTP Timeout	No RTP packets received after call answered	Open UDP ports 10000–20000 in firewall or enable RTP Proxy.
One-Way Audio	NAT / firewall blocking RTP or wrong external IP in SIP headers	Set correct “External IP” in System Parameters and open RTP range.
High CPU Usage	Too many concurrent calls or pending CDR list too large	Increase SS_MAX_CDR_PENDING_LIST_LENGTH to 15000+ and optimize server resources.
Pending CDR Not Written	Disk full or SS_CDR_WRITE_INTERVAL too high	Check /home/vos3000/cdr folder space and reduce SS_CDR_WRITE_INTERVAL to 5 seconds.
License Verify Failed	License file does not match server MAC or version	Upload the exact .lic file that matches your server MAC address for version 2.1.9.07.
401 Unauthorized	Wrong username/password in SIP trunk or account	Double-check credentials in SIP Trunk settings.
403 Forbidden	IP not allowed in SIP Trunk whitelist	Add your server IP to the gateway’s allowed list.
AS R Drop Alarm	ASR suddenly fell below alarm threshold	Set proper ASR alarm in System → Alarm Settings and add backup routes.
Balance Alarm Triggered	Account balance reached low balance warning	Configure email/SMS notification in Alarm Settings for immediate recharge alerts.
Disk Usage Alarm	/home or /var partition >85% full	Clean old CDR files or expand disk space on your dedicated server.
Process Down Alarm	VOS3000 core process crashed	Restart service with “service vos3000 restart” and check logs in /home/vos3000/log.
Network Interface Down	eth0 or main network interface lost connection	Check server network cable / VPS network settings and reboot network service.

🚨 High CPU, High Memory & Pending CDR Problems (Real Parameters)

The most common performance issue in production servers is high CPU caused by a very long pending CDR list. The official parameter SS_MAX_CDR_PENDING_LIST_LENGTH (default 5000) should be increased to 15000–25000 for servers handling 1000+ concurrent calls. You will also find SS_CDR_WRITE_INTERVAL and SS_CDR_BUFFER_SIZE in System Parameters.

🔊 One-Way Audio & RTP Issues – Most Common in 2026

According to the manual, one-way audio occurs when the RTP port range (usually 10000–20000) is blocked or the external IP is not correctly set. Go to System Parameters → set “RTP External IP” to your public IP and open the UDP range in your firewall (iptables or firewalld).

🔑 License & Version Verification Errors

Always keep the license file exactly matching your server’s MAC address and the installed version 2.1.9.07. Copy the license to /home/vos3000/license/ and restart the service. VOS3000 Troubleshooting Guide

🛡️ How to Use Alarm Management for Proactive Troubleshooting (Manual 2.11) – VOS3000 Troubleshooting Guide

VOS3000 has six major alarm categories: System, Network, Disk, Process, Mapping/Routing, and Balance. Set rise and decline thresholds for ASR, ACD, concurrent calls, and disk usage. Enable email and SMS alerts so you get notified before customers complain. VOS3000 Troubleshooting Guide

Internal resources you may also need:
* VOS3000 Secure Installation Guide 2026
* Complete VOS3000 Routing & LCR Guide
* Advanced LCR & Profit Control in VOS3000
* VoIP Fraud Prevention Best Practices
* VOS3000 Real-Time Monitoring & Dashboard Guide

📥 Download Official Manual

Download the complete VOS3000 2.1.9.07 Official English Manual (PDF)

❓ Frequently Asked Questions (FAQ) VOS3000 Troubleshooting Guide

Q1: Why is my SIP registration failing in VOS3000?

Most common reasons are firewall blocking port 5060, wrong password, or IP not whitelisted. Use Registration Analysis tool to see the exact error code.
Q2: CDR records are not showing – what should I do?

Increase SS_MAX_CDR_PENDING_LIST_LENGTH and check disk space in the CDR folder.
Q3: How do I fix one-way audio?

Set the correct external RTP IP and open UDP ports 10000–20000.
Q4: What causes high CPU usage?

Too many pending CDRs or insufficient server resources. Adjust the pending list length parameter.
Q5: How do I set up alarms for ASR drop?

Go to System → Alarm Settings and configure ASR rise/decline thresholds with email notification.

Still stuck with any VOS3000 problem? Our expert team provides instant troubleshooting, full installation, and optimized dedicated/cloud servers. 📲 WhatsApp +8801911119966 right now – we reply within minutes and solve most issues the same day. VOS3000 Troubleshooting Guide

Published: March 2026 | 100% based on official VOS3000 2.1.9.07 manual | Multahost VOS3000 Support Team

📞 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

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VOS3000 Call Termination Reasons Dictionary: Important Full Reference Guide

March 8, 2026March 8, 2026 king

VOS3000 Call Termination Reasons Dictionary: Important Full Reference Guide – Call End Reason

When troubleshooting call failures in VOS3000, the termination reason shown in CDRs is your most valuable diagnostic tool. However, many of these reasons are cryptic or misunderstood. This comprehensive VOS3000 termination reasons dictionary explains every possible call end code – both server‑generated and those received from connected devices.

Bookmark this page for quick reference whenever you encounter unexpected call failures.

How VOS3000 Call Termination Reasons Records

Every CDR in VOS3000 includes a termination reason field. This value tells you exactly why the call ended – whether it was rejected, timed out, hung up normally, or failed due to an error. Reasons come from three sources:

Server‑side – generated by the VOS3000 softswitch itself
H.323 device – received from the far‑end H.323 gateway or terminal
SIP device – received from the far‑end SIP equipment (as response codes)

Understanding these codes helps you pinpoint whether the problem is with your configuration, your carrier, or the destination network.

Server‑Side VOS3000 Call Termination Reasons (VOS3000 Generated)

These reasons are created by the VOS3000 softswitch when it decides to terminate a call. They often indicate configuration issues, resource limitations, or policy enforcement.

Termination Reason	Description	Typical Cause
Response timeout	The called party did not answer within the configured timeout period.	Phone offline, network congestion, or wrong routing gateway.
Protocol limit	The server cannot process this protocol type.	Mixing SIP and H.323 incorrectly; incompatible protocol settings.
Connection timeout	No response to SIP messages after multiple retries.	Far end down, firewall blocking, or network issues.
Busy	The called number is busy.	Destination line engaged; call forwarded to busy tone.
Account locked	The billing account is disabled.	Account manually locked, expired, or parent agent locked.
Session timeout	SIP session timer expired (no re‑INVITE received).	Far end stopped responding; network failure.
Caller’s number restricted	Caller number length exceeds allowed limit.	Wrong rewrite rule; caller ID too long for carrier.
Called number restricted	Callee number length exceeds allowed limit.	Incorrect dialing; number too long/short.
Proceeding timeout	No response after initial SETUP/INVITE.	Routing gateway not responding; carrier down.
Caller’s number prefix restricted	Mapping gateway rejects caller prefix.	Caller ID blocked by gateway settings.
Unregistered	Terminal not registered and not allowed to call.	Dynamic gateway/phone not registered.
Called number locked	The destination number is locked in the system.	Phone locked via web interface.
Called number prefix restricted	Routing gateway rejects callee prefix.	Carrier does not terminate that prefix.
Caller locked	The calling device is locked.	Gateway/phone locked in configuration.
Connection establishment timeout	Call not established within mapping gateway timeout.	Media path failure; far end not responding.
Account expired	The billing account has passed its expiry date.	Customer did not recharge on time.
Connection limit exceeded	Maximum concurrent calls reached for this gateway/account.	Too many simultaneous calls; need more capacity.
Forcible hang‑up	Server disconnected the call (admin action).	Admin clicked “disconnect” in client.
Account disabled	The account is disabled (not just locked).	Account marked as disabled by admin.
The called not online	No suitable device to receive the call.	No matching routing gateway; phone offline with no forwarding.
No‑answer forwarding by the caller	Caller‑side forwarding on no‑answer activated.	Caller set CFNR; call redirected.
Timed forwarding	Call matched time‑based forwarding rule.	Forwarding based on time of day.
On‑busy forwarding	Call matched busy forwarding rule.	Destination busy; forwarded.
No‑answer forwarding by the called	Callee‑side CFNR activated.	Phone not answered; forwarded.
Forwarding loop	Forwarding rules created an infinite loop.	Misconfigured call forwarding.
Call forwarding by the called	Unconditional call forwarding on callee side.	Phone set to forward all calls.
Do‑not‑disturb from the called	Callee has DND enabled.	Phone in DND mode.
Session closed by the called	Called party closed TCP connection without BYE.	Device crash; network disconnect.
Session closed by the caller	Caller closed TCP connection without BYE.	Device crash; network disconnect.
Illegal call	Call from unauthorized IP and unregistered number.	Hacker attempt; misconfigured gateway.
No matching rate	No rate found for the dialed number.	Missing rate prefix; incomplete rate card.
No matching account	No billing account linked to the caller.	Mapping gateway not linked to account.
Insufficient balance	Account balance below zero (including overdraft).	Customer ran out of credit.
Call restriction	Call prevented by phone/gateway restrictions.	International blocking; blacklist.
Hang‑up by the called	Called party sent normal BYE.	Normal call end.
Hang‑up by the caller	Caller sent normal BYE.	Normal call end.

SIP Device Termination Reasons (Response Codes) – VOS3000 Call Termination

When a call fails because of the remote SIP device, VOS3000 records the SIP response code received. Here are the most common ones:

SIP Code	Reason Phrase	Meaning
401	Unauthorized	Authentication failed – wrong password or missing credentials.
403	Forbidden	Call rejected by remote side (blacklist, policy).
404	Not Found	Number does not exist on remote network.
486	Busy Here	Destination line busy.
487	Request Terminated	Call cancelled (e.g., caller hung up before answer).
488	Not Acceptable Here	Codec mismatch – no common codec.
503	Service Unavailable	Remote server overloaded or down.
504	Server Time‑out	Gateway did not respond in time.
603	Decline	Call rejected by user (DND, reject).

H.323 Device Termination Reasons – VOS3000 Call Termination

H.323 devices return Q.931 cause codes. Common ones include:

Q.931 Cause	Description	Typical Cause
1	Unallocated number	Number not in service.
3	No route to destination	Network unreachable.
16	Normal call clearing	Normal hang‑up.
17	User busy	Destination busy.
18	No user responding	No answer (ring timeout).
21	Call rejected	Rejected by remote side.
22	Number changed	Number ported; redirect.
27	Destination out of order	Far end equipment failure.
28	Invalid number format	Wrong dialed digits.
34	No circuit/channel available	All trunks busy.
38	Network out of order	Carrier network failure.
41	Temporary failure	Transient network error – retry.
42	Switching equipment congestion	Overload at exchange.
47	Resource unavailable	Codec or channel resource issue.

How to Use This Information for Troubleshooting – VOS3000 Call Termination

When you see a call failure, follow this process:

Check the termination reason in the CDR.
Identify the source – server, SIP, or H.323.
Look for patterns – does it happen to one prefix, one gateway, or all calls?
Examine logs – use “Call Analysis” in the VOS3000 client to see the full signaling exchange.
Check configurations – rates, blacklists, number lengths, account balances.
Test with routing analysis – simulate the call to see which gateway would be chosen.

Frequently Asked Questions (VOS3000 Call Termination)

What does “No matching rate” mean?

This means the dialed number’s prefix did not match any rate in the rate group assigned to the caller’s account. You need to add the missing rate prefix or adjust the caller’s rate group.

Why do I see “Illegal call” in CDRs?

“Illegal call” means the incoming IP address was not recognized as a valid mapping gateway, and the caller number did not match any registered phone. This is often a hacking attempt – block the IP immediately and review your firewall rules.

What causes “488 Not Acceptable Here”?

This SIP error means the remote gateway does not support any of the codecs offered by your system. Check codec settings on both sides and ensure at least one common codec (e.g., G.729, G.711) is enabled.

How do I distinguish between a local hang‑up and a remote hang‑up?

The CDR field “Hangup side” tells you: 0 = caller, 1 = callee, 2 = server. Combined with termination reason, you can see exactly who ended the call and why.

My CDR shows “Response timeout” – what should I check?

First, verify the routing gateway is online and reachable. Then check if the remote side is answering other calls. If only specific prefixes fail, the carrier may not be sending progress signals – increase the timeout settings in the routing gateway configuration.

Conclusion – VOS3000 Call Termination

Understanding VOS3000 termination reasons is the fastest path to resolving call failures. Bookmark this reference and refer to it whenever you encounter an unfamiliar code. With practice, you’ll be able to diagnose most issues in seconds.

Need help troubleshooting persistent call failures? Contact us on WhatsApp for expert assistance: +8801911119966

Further Resources

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VOS3000 Server Rent – Dedicated Best VoIP Servers with Pre-Installed VOS3000 2.1.9.07 for High Concurrent Calls

VOS3000 Server End Reasons Definitive 25-Code Reference Guide

Table of Contents

Complete VOS3000 Server End Reasons Code Table

End Reason Categories and Severity Classification

Common End Reasons and Their Troubleshooting Steps

End Reasons and Billing Impact Analysis

How End Reasons Map to SIP and H.323 Codes

Related Resources

Frequently Asked Questions About VOS3000 Server End Reasons

What are VOS3000 server end reasons?

How do server end reasons differ from SIP response codes?

Which end reasons indicate billing problems?

How can I analyze end reasons across my CDR data?

What does Server Forced Release (code 13) mean?

Are all 25 end reason codes used in both SIP and H.323 calls?

Need Expert VOS3000 CDR Analysis?

📞 Need Professional VOS3000 Setup Support?

VOS3000 Call End Reasons: Complete Error Code Reference Guide

Table of Contents

🔍 Understanding VOS3000 Call End Reasons

📊 Where to Find VOS3000 Call End Reasons

📋 Complete VOS3000 Server-Side Termination Reasons

🔴 Account-Related Termination Reasons

🔴 Routing-Related Termination Reasons (VOS3000 Call End Reasons)

🔴 Timeout-Related Termination Reasons

🔴 Number Restriction Termination Reasons

🔴 Forwarding-Related Termination Reasons

🔴 Protocol and System Termination Reasons

📞 SIP Response Code to VOS3000 Mapping

📊 SIP 4xx Client Error Mapping

📊 SIP 5xx Server Error Mapping

📞 H.323 Cause Codes Complete Reference

📊 H.323 Q.931 Cause Codes Table (VOS3000 Call End Reasons)

🔧 CDR Analysis and Diagnosis Flow

🔍 VOS3000 Call End Reasons Diagnosis Workflow

💰 VOS3000 Support Services

🔗 Related Resources (VOS3000 Call End Reasons)

❓ Frequently Asked Questions

What is the difference between “Response Timeout” and “Connection Timeout”?

Why do I see different error codes for similar failures?

How can I filter CDR to see only failed calls?

What causes “Codec Mismatch” errors?

How do I interpret H.323 cause codes in CDR?

📞 Get Expert VOS3000 Troubleshooting Support

📞 Need Professional VOS3000 Setup Support?

VOS3000 Troubleshooting Guide 2026 – 20 Most Common Errors & Fixes (Official Manual)

Table of Contents

🔧 How to Use Official Diagnostic Tools in VOS3000 (Step-by-Step)

⚠️ 20 Most Common Errors & Real Fixes (From Official Manual 4.5) – (VOS3000 Troubleshooting Guide)

🚨 High CPU, High Memory & Pending CDR Problems (Real Parameters)

🔊 One-Way Audio & RTP Issues – Most Common in 2026

🔑 License & Version Verification Errors

🛡️ How to Use Alarm Management for Proactive Troubleshooting (Manual 2.11) – VOS3000 Troubleshooting Guide

📥 Download Official Manual

❓ Frequently Asked Questions (FAQ) VOS3000 Troubleshooting Guide

📞 Need Professional VOS3000 Setup Support?

VOS3000 Call Termination Reasons Dictionary: Important Full Reference Guide – Call End Reason

Table of Contents

How VOS3000 Call Termination Reasons Records

Server‑Side VOS3000 Call Termination Reasons (VOS3000 Generated)

SIP Device Termination Reasons (Response Codes) – VOS3000 Call Termination

H.323 Device Termination Reasons – VOS3000 Call Termination

How to Use This Information for Troubleshooting – VOS3000 Call Termination

Frequently Asked Questions (VOS3000 Call Termination)

What does “No matching rate” mean?

Why do I see “Illegal call” in CDRs?

What causes “488 Not Acceptable Here”?

How do I distinguish between a local hang‑up and a remote hang‑up?

My CDR shows “Response timeout” – what should I check?

Conclusion – VOS3000 Call Termination

Further Resources