{"id":3445,"date":"2026-04-29T16:02:42","date_gmt":"2026-04-29T16:02:42","guid":{"rendered":"https:\/\/multahost.com\/blog\/?p=3445"},"modified":"2026-04-29T16:11:40","modified_gmt":"2026-04-29T16:11:40","slug":"vos3000-call-authentication-mode","status":"publish","type":"post","link":"https:\/\/multahost.com\/blog\/vos3000-call-authentication-mode\/","title":{"rendered":"VOS3000 Call Authentication Mode: Comprehensive IP Port Password Selection"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\" id=\"vos-3000-call-authentication-mode-comprehensive-ip-port-password-selection\">VOS3000 Call Authentication Mode: Comprehensive IP Port Password Selection<\/h1>\n\n\n\n<p>\ud83d\udd10 Every call that enters your VOS3000 softswitch through a mapping gateway must be authenticated \u2014 but the method of authentication directly affects both security and ease of deployment. The <strong>VOS3000 call authentication mode<\/strong> offers three distinct options \u2014 IP only, IP+Port, and Password \u2014 each with different security trade-offs, configuration requirements, and use cases that every VoIP engineer must understand. \ud83d\udee1\ufe0f<\/p>\n\n\n\n<p>\u2699\ufe0f The mapping gateway is where external SIP traffic enters your VOS3000 system. When an INVITE or REGISTER arrives from a mapping gateway, VOS3000 must verify that the source is authorized before processing the call. The <strong>VOS3000 call authentication mode<\/strong> determines how this verification works: IP-only mode simply checks the source IP address, IP+Port mode checks both the IP and source port, and Password mode requires SIP digest authentication with a username and password. The choice between these modes is one of the most fundamental security decisions in any VOS3000 deployment. \ud83d\udd27<\/p>\n\n\n\n<p>\ud83c\udfaf This guide covers all three <strong>VOS3000 call authentication mode<\/strong> options from the VOS3000 2.1.9.07 manual \u00a74.3.5.2, including how each mode works, security trade-offs, when to use each, and step-by-step configuration in the mapping gateway settings panel. Need help? WhatsApp us at <strong>+8801911119966<\/strong> for professional VOS3000 configuration. \ud83d\udcde<\/p>\n\n\n\n<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><h2>Table of Contents<\/h2><nav><ul><li><a href=\"#vos-3000-call-authentication-mode-comprehensive-ip-port-password-selection\">VOS3000 Call Authentication Mode: Comprehensive IP Port Password Selection<\/a><ul><li><a href=\"#\ud83d\udd10-what-is-the-vos-3000-call-authentication-mode\">\ud83d\udd10 What Is the VOS3000 Call Authentication Mode?<\/a><ul><li><a href=\"#\ud83d\udccb-vos-3000-call-authentication-mode-comparison\">\ud83d\udccb VOS3000 Call Authentication Mode Comparison<\/a><\/li><\/ul><\/li><li><a href=\"#\u2699\ufe0f-mode-1-ip-authentication-verify-ip-address-only\">\u2699\ufe0f Mode 1: IP Authentication \u2014 Verify IP Address Only<\/a><\/li><li><a href=\"#\u2699\ufe0f-mode-2-ip-port-authentication-verify-address-and-port\">\u2699\ufe0f Mode 2: IP + Port Authentication \u2014 Verify Address and Port<\/a><\/li><li><a href=\"#\u2699\ufe0f-mode-3-password-authentication-full-sip-digest-auth\">\u2699\ufe0f Mode 3: Password Authentication \u2014 Full SIP Digest Auth<\/a><ul><li><a href=\"#\ud83d\udccb-password-mode-configuration-requirements\">\ud83d\udccb Password Mode Configuration Requirements<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udccb-step-by-step-vos-3000-call-authentication-mode-configuration\">\ud83d\udccb Step-by-Step VOS3000 Call Authentication Mode Configuration<\/a><ul><li><a href=\"#step-1-access-mapping-gateway-settings-\ud83c\udf10\">Step 1: Access Mapping Gateway Settings \ud83c\udf10<\/a><\/li><li><a href=\"#step-2-select-authentication-mode-\ud83c\udfaf\">Step 2: Select Authentication Mode \ud83c\udfaf<\/a><\/li><li><a href=\"#step-3-configure-mode-specific-settings-\ud83d\udd27\">Step 3: Configure Mode-Specific Settings \ud83d\udd27<\/a><\/li><li><a href=\"#step-4-test-authentication-\ud83d\udd0d\">Step 4: Test Authentication \ud83d\udd0d<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udee1\ufe0f-common-vos-3000-call-authentication-mode-problems-and-solutions\">\ud83d\udee1\ufe0f Common VOS3000 Call Authentication Mode Problems and Solutions<\/a><ul><li><a href=\"#\u274c-problem-1-ip-port-auth-fails-for-nat-traversed-gateway\">\u274c Problem 1: IP+Port Auth Fails for NAT-Traversed Gateway<\/a><\/li><li><a href=\"#\u274c-problem-2-password-auth-creates-high-cpu-load\">\u274c Problem 2: Password Auth Creates High CPU Load<\/a><\/li><li><a href=\"#\u274c-problem-3-gateway-sends-credentials-but-auth-still-fails\">\u274c Problem 3: Gateway Sends Credentials But Auth Still Fails<\/a><\/li><\/ul><\/li><li><a href=\"#\u2753-frequently-asked-questions\">\u2753 Frequently Asked Questions<\/a><ul><li><a href=\"#\u2753-what-is-the-vos-3000-call-authentication-mode\">\u2753 What is the VOS3000 call authentication mode?<\/a><\/li><li><a href=\"#\u2753-which-authentication-mode-should-i-use\">\u2753 Which authentication mode should I use?<\/a><\/li><li><a href=\"#\u2753-can-i-use-different-authentication-modes-for-different-gateways\">\u2753 Can I use different authentication modes for different gateways?<\/a><\/li><li><a href=\"#\u2753-does-password-authentication-work-with-nat\">\u2753 Does Password authentication work with NAT?<\/a><\/li><li><a href=\"#\u2753-how-does-ip-spoofing-affect-ip-only-authentication\">\u2753 How does IP spoofing affect IP-only authentication?<\/a><\/li><li><a href=\"#\u2753-what-happens-when-authentication-fails\">\u2753 What happens when authentication fails?<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udcde-need-expert-help-with-vos-3000-call-authentication-mode\">\ud83d\udcde Need Expert Help with VOS3000 Call Authentication Mode?<\/a><\/li><li><a href=\"#\ud83d\udcde-need-call-center-setup-support\">\ud83d\udcde Need Professional VOS3000 Setup Support?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udd10-what-is-the-vos-3000-call-authentication-mode\">\ud83d\udd10 What Is the VOS3000 Call Authentication Mode?<\/h2>\n\n\n\n<p>\u23f1\ufe0f The <strong>VOS3000 call authentication mode<\/strong> defines how VOS3000 verifies the identity of SIP traffic arriving through mapping gateways. According to the official VOS3000 2.1.9.07 manual \u00a74.3.5.2, the mapping gateway settings panel provides three authentication mode options: IP (verify IP Address only), IP Address and Port (verify both IP and port), and Password authentication (using password authentication method). This setting is configured per mapping gateway, allowing you to use different authentication modes for different gateway connections. \ud83d\udcde<\/p>\n\n\n\n<p>\ud83d\udca1 <strong>Why authentication mode selection matters:<\/strong> The authentication mode directly determines how difficult it is for an attacker to impersonate a legitimate gateway. IP-only authentication can be spoofed, IP+Port is slightly harder to spoof, and password authentication provides the strongest protection but requires credential management. Choosing the wrong mode for your deployment can leave your system vulnerable to toll fraud, unauthorized call routing, and revenue loss.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udce1 Three modes: IP, IP+Port, Password<\/li>\n\n\n\n<li>\ud83d\udd04 Configured per mapping gateway for flexible security<\/li>\n\n\n\n<li>\ud83d\udcca Each mode offers different security and convenience trade-offs<\/li>\n\n\n\n<li>\ud83d\udee1\ufe0f Password mode provides strongest protection; IP mode is simplest<\/li>\n\n\n\n<li>\ud83c\udfaf Must balance security requirements with operational practicality<\/li>\n<\/ul>\n\n\n\n<p>\ud83d\udccd <strong>Location in VOS3000 Client:<\/strong> Operation management \u2192 Gateway operation \u2192 Mapping gateway \u2192 (select gateway) \u2192 Additional settings \u2192 Protocol \u2192 SIP \u2192 Call authentication mode<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udccb-vos-3000-call-authentication-mode-comparison\">\ud83d\udccb VOS3000 Call Authentication Mode Comparison<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">Aspect<\/th><th class=\"has-text-align-left\" data-align=\"left\">IP Only<\/th><th class=\"has-text-align-left\" data-align=\"left\">IP + Port<\/th><th class=\"has-text-align-left\" data-align=\"left\">Password<\/th><\/tr><tr><td>\ud83d\udd27 What Is Verified<\/td><td>Source IP address only<\/td><td>Source IP + source port<\/td><td>Username + password (digest auth)<\/td><\/tr><tr><td>\ud83d\udee1\ufe0f Security Level<\/td><td>\ud83d\udfe1 Basic<\/td><td>\ud83d\udfe0 Moderate<\/td><td>\ud83d\udfe2 Strong<\/td><\/tr><tr><td>\ud83d\udcca Spoofing Risk<\/td><td>Higher \u2014 IP spoofing possible<\/td><td>Lower \u2014 port binding harder to spoof<\/td><td>Lowest \u2014 requires valid credentials<\/td><\/tr><tr><td>\ud83d\udcde Configuration Complexity<\/td><td>Simple \u2014 just set IP<\/td><td>Simple \u2014 set IP and port<\/td><td>More complex \u2014 credentials + auth<\/td><\/tr><tr><td>\ud83c\udfe2 Best For<\/td><td>Trusted private networks<\/td><td>Semi-trusted networks, NAT<\/td><td>Public internet, high-security<\/td><\/tr><tr><td>\u26a0\ufe0f NAT Impact<\/td><td>Works through NAT<\/td><td>May fail through NAT (port changes)<\/td><td>Works through NAT<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u2699\ufe0f-mode-1-ip-authentication-verify-ip-address-only\">\u2699\ufe0f Mode 1: IP Authentication \u2014 Verify IP Address Only<\/h2>\n\n\n\n<p>\ud83d\udd27 IP authentication is the simplest <strong>VOS3000 call authentication mode<\/strong>. VOS3000 checks only the source IP address of incoming SIP messages against the mapping gateway&#8217;s configured IP address. If the source IP matches, the call is accepted without any further verification. This mode requires no credentials \u2014 the IP address itself serves as the authentication token.<\/p>\n\n\n\n<p>\ud83d\udca1 <strong>When to use IP authentication:<\/strong> IP-only mode is appropriate for trusted private networks where you control the entire infrastructure and can guarantee that only authorized devices use the configured IP addresses. It is commonly used for internal gateway connections within a data center, where all traffic flows over a secure management network that is isolated from the internet.<\/p>\n\n\n\n<p>\u26a0\ufe0f <strong>Security limitation:<\/strong> IP addresses can be spoofed by attackers with access to the network path between the gateway and VOS3000. If an attacker can send packets with a forged source IP that matches a configured mapping gateway, they can make calls through your system without knowing any credentials. This is why IP-only mode should never be used for internet-facing gateways.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u2699\ufe0f-mode-2-ip-port-authentication-verify-address-and-port\">\u2699\ufe0f Mode 2: IP + Port Authentication \u2014 Verify Address and Port<\/h2>\n\n\n\n<p>\ud83d\udd27 IP+Port authentication adds the source port to the verification check. In addition to matching the source IP address, VOS3000 also verifies that the source port matches the configured port in the mapping gateway settings. This provides a modest security improvement over IP-only mode, as the attacker would need to both spoof the IP address and use the correct source port.<\/p>\n\n\n\n<p>\ud83d\udca1 <strong>When to use IP+Port authentication:<\/strong> IP+Port mode is useful in semi-trusted environments where you want an additional verification layer beyond IP alone. It can help detect misconfigured gateways that are sending from unexpected ports. However, it has a significant limitation: NAT devices often change the source port of SIP packets, causing authentication failures when the gateway is behind NAT.<\/p>\n\n\n\n<p>\u26a0\ufe0f <strong>NAT limitation:<\/strong> When a SIP gateway sends packets through a NAT device, the NAT typically rewrites the source port to an arbitrary value. This means the source port that VOS3000 sees will not match the port configured in the mapping gateway, causing authentication to fail. For NAT-traversed gateways, use IP-only or Password mode instead.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u2699\ufe0f-mode-3-password-authentication-full-sip-digest-auth\">\u2699\ufe0f Mode 3: Password Authentication \u2014 Full SIP Digest Auth<\/h2>\n\n\n\n<p>\ud83d\udd27 Password authentication is the most secure <strong>VOS3000 call authentication mode<\/strong>. It requires the mapping gateway to complete a full SIP digest authentication challenge-response cycle before calls are accepted. VOS3000 sends a 401 Unauthorized challenge, and the gateway must respond with the correct digest calculated using its configured username and password. This provides the same level of authentication used for SIP phone registrations. \ud83d\udd27<\/p>\n\n\n\n<p>\ud83d\udca1 <strong>When to use Password authentication:<\/strong> Password mode is strongly recommended for any gateway that connects over the public internet, connects to an upstream SIP trunk provider, or operates in an untrusted network environment. It is also the correct choice for NAT-traversed gateways, since digest authentication works correctly regardless of NAT-induced IP and port changes. While it requires more configuration (setting up credentials on both VOS3000 and the gateway), the security benefit is substantial.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udccb-password-mode-configuration-requirements\">\ud83d\udccb Password Mode Configuration Requirements<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">Requirement<\/th><th class=\"has-text-align-left\" data-align=\"left\">VOS3000 Side<\/th><th class=\"has-text-align-left\" data-align=\"left\">Gateway Side<\/th><\/tr><tr><td>\ud83d\udcdd Username<\/td><td>Set in mapping gateway auth settings<\/td><td>Configure outbound proxy username<\/td><\/tr><tr><td>\ud83d\udd11 Password<\/td><td>Set in mapping gateway auth settings<\/td><td>Configure outbound proxy password<\/td><\/tr><tr><td>\ud83d\udd04 Auth Mode<\/td><td>Set &#8220;Call authentication mode&#8221; to Password<\/td><td>Enable SIP digest authentication<\/td><\/tr><tr><td>\ud83d\udcde SIP Realm<\/td><td>Automatic (VOS3000 domain)<\/td><td>Match VOS3000 SIP domain\/realm<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udccb-step-by-step-vos-3000-call-authentication-mode-configuration\">\ud83d\udccb Step-by-Step VOS3000 Call Authentication Mode Configuration<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"step-1-access-mapping-gateway-settings-\ud83c\udf10\">Step 1: Access Mapping Gateway Settings \ud83c\udf10<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\ud83d\udd10 Log in to VOS3000 Client<\/li>\n\n\n\n<li>\ud83d\udccc Navigate: <strong>Operation management \u2192 Gateway operation \u2192 Mapping gateway<\/strong><\/li>\n\n\n\n<li>\ud83d\udd0d Select the target mapping gateway<\/li>\n\n\n\n<li>\ud83d\udccb Go to <strong>Additional settings \u2192 Protocol \u2192 SIP<\/strong><\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"step-2-select-authentication-mode-\ud83c\udfaf\">Step 2: Select Authentication Mode \ud83c\udfaf<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\ud83d\udcdd Find the <strong>&#8220;Call authentication mode&#8221;<\/strong> dropdown<\/li>\n\n\n\n<li>\u270f\ufe0f Select the appropriate mode:\n<ul class=\"wp-block-list\">\n<li><strong>IP<\/strong> \u2014 for trusted private networks<\/li>\n\n\n\n<li><strong>IP Address and Port<\/strong> \u2014 for semi-trusted networks without NAT<\/li>\n\n\n\n<li><strong>Password authentication required<\/strong> \u2014 for public internet and high-security<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"step-3-configure-mode-specific-settings-\ud83d\udd27\">Step 3: Configure Mode-Specific Settings \ud83d\udd27<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>For IP mode: Set the gateway IP address in the mapping gateway configuration<\/li>\n\n\n\n<li>For IP+Port mode: Set both the IP address and SIP port<\/li>\n\n\n\n<li>For Password mode: Set the username and password for digest authentication<\/li>\n\n\n\n<li>\ud83d\udcbe Save the gateway configuration<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"step-4-test-authentication-\ud83d\udd0d\">Step 4: Test Authentication \ud83d\udd0d<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\ud83d\udcde Make a test call through the mapping gateway<\/li>\n\n\n\n<li>\ud83d\udcca Verify the call is accepted (authenticated) or rejected (auth failed)<\/li>\n\n\n\n<li>\ud83d\udd27 Check VOS3000 SIP debug for authentication challenge-response details<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udee1\ufe0f-common-vos-3000-call-authentication-mode-problems-and-solutions\">\ud83d\udee1\ufe0f Common VOS3000 Call Authentication Mode Problems and Solutions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-1-ip-port-auth-fails-for-nat-traversed-gateway\">\u274c Problem 1: IP+Port Auth Fails for NAT-Traversed Gateway<\/h3>\n\n\n\n<p>\ud83d\udd0d <strong>Symptom:<\/strong> A mapping gateway behind NAT fails authentication even though the IP address matches.<\/p>\n\n\n\n<p>\ud83d\udca1 <strong>Cause:<\/strong> The NAT device changes the source port, so the port VOS3000 sees does not match the configured port.<\/p>\n\n\n\n<p>\u2705 <strong>Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udd27 Switch to IP-only or Password authentication mode<\/li>\n\n\n\n<li>\ud83d\udcca Configure a static NAT mapping that preserves the source port<\/li>\n\n\n\n<li>\ud83d\udcde Use <a href=\"https:\/\/multahost.com\/blog\/vos3000-sip-nat-keep-alive\/\">NAT keepalive<\/a> to maintain the NAT binding<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-2-password-auth-creates-high-cpu-load\">\u274c Problem 2: Password Auth Creates High CPU Load<\/h3>\n\n\n\n<p>\ud83d\udd0d <strong>Symptom:<\/strong> After switching to Password mode, VOS3000 CPU usage increases significantly.<\/p>\n\n\n\n<p>\ud83d\udca1 <strong>Cause:<\/strong> Digest authentication requires cryptographic calculations (MD5 hashing) for every call attempt, which is more CPU-intensive than simple IP matching.<\/p>\n\n\n\n<p>\u2705 <strong>Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udd27 This is expected \u2014 Password mode requires more processing than IP mode<\/li>\n\n\n\n<li>\ud83d\udcca Ensure your server has adequate CPU capacity for the call volume<\/li>\n\n\n\n<li>\ud83d\udcde For extremely high CPS, use IP mode on trusted internal gateways and Password only on external ones<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-3-gateway-sends-credentials-but-auth-still-fails\">\u274c Problem 3: Gateway Sends Credentials But Auth Still Fails<\/h3>\n\n\n\n<p>\ud83d\udd0d <strong>Symptom:<\/strong> The gateway is configured with the correct username and password, but VOS3000 still rejects the authentication.<\/p>\n\n\n\n<p>\ud83d\udca1 <strong>Cause:<\/strong> Common causes include mismatched SIP realm, incorrect authentication algorithm, or clock skew affecting nonce validation.<\/p>\n\n\n\n<p>\u2705 <strong>Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udd27 Verify the SIP realm\/domain matches between VOS3000 and the gateway<\/li>\n\n\n\n<li>\ud83d\udcca Check that both sides use the same digest algorithm (typically MD5)<\/li>\n\n\n\n<li>\ud83d\udcde Ensure NTP is configured on both systems for clock synchronization<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u2753-frequently-asked-questions\">\u2753 Frequently Asked Questions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-what-is-the-vos-3000-call-authentication-mode\">\u2753 What is the VOS3000 call authentication mode?<\/h3>\n\n\n\n<p>\u23f1\ufe0f The <strong>VOS3000 call authentication mode<\/strong> defines how mapping gateways are authenticated when sending SIP traffic to VOS3000. There are three modes: IP (verify source IP address only), IP Address and Port (verify source IP and source port), and Password (full SIP digest authentication with username and password). Each mode provides a different balance of security and convenience. The setting is configured per mapping gateway in the Additional settings \u2192 Protocol \u2192 SIP section. It is documented in the VOS3000 2.1.9.07 manual \u00a74.3.5.2.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-which-authentication-mode-should-i-use\">\u2753 Which authentication mode should I use?<\/h3>\n\n\n\n<p>\ud83d\udd27 For internet-facing or untrusted network connections, always use <strong>Password authentication<\/strong> mode. This provides the strongest protection against unauthorized access and works correctly through NAT. For internal gateway connections on a trusted private network, IP-only mode is acceptable and simpler to configure. IP+Port mode offers moderate security improvement over IP-only but often fails with NAT-traversed gateways. When in doubt, use Password mode \u2014 the additional configuration effort is minimal compared to the security benefit.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-can-i-use-different-authentication-modes-for-different-gateways\">\u2753 Can I use different authentication modes for different gateways?<\/h3>\n\n\n\n<p>\ud83d\udcca Yes, the <strong>VOS3000 call authentication mode<\/strong> is configured per mapping gateway. This means you can use Password authentication for internet-facing SIP trunk gateways while using IP-only authentication for internal gateways on your trusted LAN. This flexibility lets you apply appropriate security levels based on each gateway&#8217;s network environment and risk profile without forcing a one-size-fits-all approach.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-does-password-authentication-work-with-nat\">\u2753 Does Password authentication work with NAT?<\/h3>\n\n\n\n<p>\ud83d\udcde Yes, Password authentication works correctly through NAT. Unlike IP+Port mode, which fails when the NAT device changes the source port, Password authentication relies on the SIP digest challenge-response mechanism that is independent of the source IP and port. The credentials are validated based on the content of the SIP headers, not the transport layer addresses. This makes Password mode the recommended choice for any gateway that is behind NAT. For more on NAT configuration, see our <a href=\"https:\/\/multahost.com\/blog\/vos3000-sip-nat-keep-alive\/\">NAT keepalive guide<\/a>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-how-does-ip-spoofing-affect-ip-only-authentication\">\u2753 How does IP spoofing affect IP-only authentication?<\/h3>\n\n\n\n<p>\ud83d\udee1\ufe0f With IP-only authentication, an attacker who can send packets with a forged source IP address matching your mapping gateway&#8217;s configured IP can bypass authentication entirely. This is known as IP spoofing and is possible when the attacker has access to the network path between their location and your VOS3000 server. While modern networks make IP spoofing more difficult through ingress filtering, it remains a risk \u2014 especially on public networks. This is why IP-only mode should be restricted to trusted private networks and never used for internet-facing gateways.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-what-happens-when-authentication-fails\">\u2753 What happens when authentication fails?<\/h3>\n\n\n\n<p>\ud83d\udcca When a mapping gateway fails authentication, VOS3000 rejects the SIP request with an appropriate error response. For Password mode, this is typically a SIP 401 Unauthorized or 403 Forbidden response. For IP\/IP+Port mode, the request may be silently dropped or rejected depending on the SS_REPLY_UNAUTHORIZED setting. The failed call is logged in the CDR with the appropriate termination reason. For detailed error analysis, see our <a href=\"https:\/\/multahost.com\/blog\/vos3000-call-termination-reasons\/\">call termination reasons<\/a> guide. WhatsApp us at <strong>+8801911119966<\/strong> for expert help. \ud83d\udcde<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcde-need-expert-help-with-vos-3000-call-authentication-mode\">\ud83d\udcde Need Expert Help with VOS3000 Call Authentication Mode?<\/h2>\n\n\n\n<p>\ud83d\udd27 Proper <strong>VOS3000 call authentication mode<\/strong> configuration is essential for securing your SIP gateway connections and preventing unauthorized call routing. Whether you need help selecting the right authentication mode, configuring digest authentication, or troubleshooting gateway connectivity issues, our team is ready to assist. Reach us on WhatsApp at <strong>+8801911119966<\/strong> for professional VOS3000 configuration services. \ud83d\udcde<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcde-need-call-center-setup-support\">\ud83d\udcde Need Professional VOS3000 Setup Support?<\/h2>\n\n\n\n<p>For professional VOS3000 installations and deployment, VOS3000 Server Rental Solution:<\/p>\n\n\n\n<p>\ud83d\udcf1 <strong>WhatsApp:<\/strong> <a href=\"https:\/\/wa.me\/8801911119966\" target=\"_blank\" rel=\"noopener\">+8801911119966<\/a><br>\ud83c\udf10 <strong>Website:<\/strong> <a href=\"https:\/\/www.vos3000.com\" target=\"_blank\" rel=\"noopener\">www.vos3000.com<\/a><br>\ud83c\udf10 <strong>Blog:<\/strong> <a href=\"https:\/\/multahost.com\/blog\">multahost.com\/blog<\/a><br>\ud83d\udce5 <strong>Downloads:<\/strong> <a href=\"https:\/\/www.vos3000.com\/downloads.php\" target=\"_blank\" rel=\"noopener\">VOS3000 Downloads<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><img data-recalc-dims=\"1\" height=\"1024\" width=\"768\" decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" alt=\"VOS3000 Gateway Switch Limit, VOS3000 RTP Lock-In, VOS3000 Aggressive Gateway Failover, VOS3000 Busy Stop Switch, VOS3000 real-time gateway ASR, VOS3000 ASR Cost Routing, VOS3000 Prefix Mode Extension, VOS3000 Period Capacity Configuration, VOS3000 Period Dial Plan, VOS3000 RTP Interrupt Detection, VOS3000 Lowest Profit Rate Limit, VOS3000 Max Minute Rate Cap, VOS3000 Sort Lowest Rate Per Second, VOS3000 Check Rate Before Routing, VOS3000 Sort by Lowest Rate, VOS3000 Bilateral Reconciliation, VOS3000 SIP OPTIONS Online Check, VOS3000 T38 Fax Over IP, VOS3000 G729 Annex B Silence, VOS3000 Gateway Group Reserved Lines, VOS3000 Auxiliary Ring Tone, VOS3000 Black White List Groups, VOS3000 System White List, VOS3000 Callee Balance Verification, VOS3000 Dial Plan Wildcards, VOS3000 Number Length Matching, VOS3000 Random Routing Patterns, VOS3000 Position Keeper Dollar, VOS3000 LRN Number Portability, VOS3000 LRN Numbers, VOS3000 Malicious Caller Blacklist, VOS3000 No-Answer Auto-Blacklist, VOS3000 Concurrent Call Abuse Blacklist, VOS3000 Login Brute-Force Lockout, VOS3000 Password Policy Configuration, VOS3000 Unauthorized SIP Response, VOS3000 TCP Close Reset, VOS3000 Registration Replace Kick, VOS3000 Lightweight Registration Interval, VOS3000 Authentication Retry Limits, VOS3000 Call Authentication Mode\" title=\"\" class=\"lazyload\" data-src=\"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-RTP-Lock-In-VOS3000-Aggressive-Gateway-Failover-1.png?resize=768%2C1024\"><\/td><td><img data-recalc-dims=\"1\" height=\"1024\" width=\"768\" decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" alt=\"VOS3000 Gateway Switch Limit, VOS3000 RTP Lock-In, VOS3000 Aggressive Gateway Failover, VOS3000 Busy Stop Switch, VOS3000 real-time gateway ASR, VOS3000 ASR Cost Routing, VOS3000 Prefix Mode Extension, VOS3000 Period Capacity Configuration, VOS3000 Period Dial Plan, VOS3000 RTP Interrupt Detection, VOS3000 Lowest Profit Rate Limit, VOS3000 Max Minute Rate Cap, VOS3000 Sort Lowest Rate Per Second, VOS3000 Check Rate Before Routing, VOS3000 Sort by Lowest Rate, VOS3000 Bilateral Reconciliation, VOS3000 SIP OPTIONS Online Check, VOS3000 T38 Fax Over IP, VOS3000 G729 Annex B Silence, VOS3000 Gateway Group Reserved Lines, VOS3000 Auxiliary Ring Tone, VOS3000 Black White List Groups, VOS3000 System White List, VOS3000 Callee Balance Verification, VOS3000 Dial Plan Wildcards, VOS3000 Number Length Matching, VOS3000 Random Routing Patterns, VOS3000 Position Keeper Dollar, VOS3000 LRN Number Portability, VOS3000 LRN Numbers, VOS3000 Malicious Caller Blacklist, VOS3000 No-Answer Auto-Blacklist, VOS3000 Concurrent Call Abuse Blacklist, VOS3000 Login Brute-Force Lockout, VOS3000 Password Policy Configuration, VOS3000 Unauthorized SIP Response, VOS3000 TCP Close Reset, VOS3000 Registration Replace Kick, VOS3000 Lightweight Registration Interval, VOS3000 Authentication Retry Limits, VOS3000 Call Authentication Mode\" title=\"\" class=\"lazyload\" data-src=\"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-RTP-Lock-In-VOS3000-Aggressive-Gateway-Failover-1.png?resize=768%2C1024\"><\/td><td><img data-recalc-dims=\"1\" height=\"1024\" width=\"768\" decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" alt=\"VOS3000 Gateway Switch Limit, VOS3000 RTP Lock-In, VOS3000 Aggressive Gateway Failover, VOS3000 Busy Stop Switch, VOS3000 real-time gateway ASR, VOS3000 ASR Cost Routing, VOS3000 Prefix Mode Extension, VOS3000 Period Capacity Configuration, VOS3000 Period Dial Plan, VOS3000 RTP Interrupt Detection, VOS3000 Lowest Profit Rate Limit, VOS3000 Max Minute Rate Cap, VOS3000 Sort Lowest Rate Per Second, VOS3000 Check Rate Before Routing, VOS3000 Sort by Lowest Rate, VOS3000 Bilateral Reconciliation, VOS3000 SIP OPTIONS Online Check, VOS3000 T38 Fax Over IP, VOS3000 G729 Annex B Silence, VOS3000 Gateway Group Reserved Lines, VOS3000 Auxiliary Ring Tone, VOS3000 Black White List Groups, VOS3000 System White List, VOS3000 Callee Balance Verification, VOS3000 Dial Plan Wildcards, VOS3000 Number Length Matching, VOS3000 Random Routing Patterns, VOS3000 Position Keeper Dollar, VOS3000 LRN Number Portability, VOS3000 LRN Numbers, VOS3000 Malicious Caller Blacklist, VOS3000 No-Answer Auto-Blacklist, VOS3000 Concurrent Call Abuse Blacklist, VOS3000 Login Brute-Force Lockout, VOS3000 Password Policy Configuration, VOS3000 Unauthorized SIP Response, VOS3000 TCP Close Reset, VOS3000 Registration Replace Kick, VOS3000 Lightweight Registration Interval, VOS3000 Authentication Retry Limits, VOS3000 Call Authentication Mode\" title=\"\" class=\"lazyload\" data-src=\"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-RTP-Lock-In-VOS3000-Aggressive-Gateway-Failover-1.png?resize=768%2C1024\"><\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Master VOS3000 call authentication mode with IP, IP+Port, and Password options. Configure mapping gateway authentication for secure VoIP deployments.<\/p>\n","protected":false},"author":1,"featured_media":3439,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[2,763,740,793,583],"tags":[11293,11280,11273,11296,11284,11300,11291,11271,11267,11297,11278,11301,11283,11281,11287,11272,11289,3415,11299,5091,11275,4005,11282,11274,11269,11295,11268,11286,11294,8976,11277,6703,11288,11285,11270,11290,11279,11302,8350,11276,11298,11292],"class_list":["post-3445","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vos3000","category-vos3000-call-analytics","category-vos3000-call-per-second","category-vos3000-call-quality","category-vos3000-call-routing","tag-vos3000-authentication-mode-comparison","tag-vos3000-authentication-mode-guide","tag-vos3000-authentication-mode-selection","tag-vos3000-authentication-mode-setup","tag-vos3000-authentication-options","tag-vos3000-authentication-three-modes","tag-vos3000-call-auth-parameters","tag-vos3000-call-authentication-configuration","tag-vos3000-call-authentication-mode","tag-vos3000-call-authentication-security","tag-vos3000-call-authentication-settings","tag-vos3000-call-authentication-type","tag-vos3000-call-mode-settings","tag-vos3000-call-security-mode","tag-vos3000-gateway-auth-configuration","tag-vos3000-gateway-auth-mode","tag-vos3000-gateway-authentication-types","tag-vos3000-gateway-configuration","tag-vos3000-gateway-mode-selection","tag-vos3000-gateway-security","tag-vos3000-ip-and-port-authentication","tag-vos3000-ip-authentication","tag-vos3000-ip-authentication-mode","tag-vos3000-ip-only-authentication","tag-vos3000-ip-port-authentication","tag-vos3000-ip-vs-password-auth","tag-vos3000-mapping-gateway-authentication","tag-vos3000-mapping-gateway-mode","tag-vos3000-mapping-gateway-panel","tag-vos3000-mapping-gateway-settings","tag-vos3000-password-auth-gateway","tag-vos3000-password-authentication","tag-vos3000-password-gateway-mode","tag-vos3000-port-authentication","tag-vos3000-sip-authentication-mode","tag-vos3000-sip-call-authentication","tag-vos3000-sip-gateway-authentication","tag-vos3000-sip-security-configuration","tag-vos3000-softswitch-authentication","tag-vos3000-voip-authentication-mode","tag-vos3000-voip-call-security","tag-vos3000-voip-gateway-auth"],"acf":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-Registration-Replace-Kick-VOS3000-Lightweight-Registration-Interval-VOS3000-Authentication-Retry-Limits-2.png?fit=1536%2C1024&ssl=1","jetpack-related-posts":[{"id":1809,"url":"https:\/\/multahost.com\/blog\/vos3000-vicidial-auto-dialer\/","url_meta":{"origin":3445,"position":0},"title":"VOS3000 VICIdial Auto Dialer Solution \u2013 Call Center Important Setup Guide","author":"king","date":"March 13, 2026","format":false,"excerpt":"Complete guide to VOS3000 VICIdial auto dialer solution for call centers. Learn how VICIdial connects with VOS3000 for routing and telecom carrier management.","rel":"","context":"In &quot;VOS3000&quot;","block_context":{"text":"VOS3000","link":"https:\/\/multahost.com\/blog\/category\/vos3000\/"},"img":{"alt_text":"best voip softswitch, vos3000 routing, vos3000 vicidial auto dialer, vos3000 sip trunk configuration","src":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/best-voip-softswitch.png?fit=1200%2C800&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/best-voip-softswitch.png?fit=1200%2C800&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/best-voip-softswitch.png?fit=1200%2C800&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/best-voip-softswitch.png?fit=1200%2C800&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/best-voip-softswitch.png?fit=1200%2C800&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":3404,"url":"https:\/\/multahost.com\/blog\/vos3000-no-answer-auto-blacklist\/","url_meta":{"origin":3445,"position":1},"title":"VOS3000 No-Answer Auto-Blacklist: Proven SS_BLACK_LIST_NO_ANSWER Configuration","author":"king","date":"April 28, 2026","format":false,"excerpt":"Configure VOS3000 no-answer auto-blacklist with SS_BLACK_LIST_NO_ANSWER. Block dead-end numbers, prevent wasted port capacity, and optimize routing.","rel":"","context":"In &quot;VOS3000&quot;","block_context":{"text":"VOS3000","link":"https:\/\/multahost.com\/blog\/category\/vos3000\/"},"img":{"alt_text":"VOS3000 Malicious Caller Blacklist, VOS3000 No-Answer Auto-Blacklist, VOS3000 Concurrent Call Abuse Blacklist, VOS3000 Login Brute-Force Lockout, VOS3000 Password Policy Configuration, VOS3000 Unauthorized SIP Response, VOS3000 TCP Close Reset, VOS3000 Registration Replace Kick, VOS3000 Lightweight Registration Interval, VOS3000 Authentication Retry Limits, VOS3000 Call Authentication Mode","src":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-Registration-Replace-Kick-VOS3000-Lightweight-Registration-Interval-VOS3000-Authentication-Retry-Limits-VOS3000-Call-Authentication-Mode-1.png?fit=1200%2C800&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-Registration-Replace-Kick-VOS3000-Lightweight-Registration-Interval-VOS3000-Authentication-Retry-Limits-VOS3000-Call-Authentication-Mode-1.png?fit=1200%2C800&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-Registration-Replace-Kick-VOS3000-Lightweight-Registration-Interval-VOS3000-Authentication-Retry-Limits-VOS3000-Call-Authentication-Mode-1.png?fit=1200%2C800&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-Registration-Replace-Kick-VOS3000-Lightweight-Registration-Interval-VOS3000-Authentication-Retry-Limits-VOS3000-Call-Authentication-Mode-1.png?fit=1200%2C800&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-Registration-Replace-Kick-VOS3000-Lightweight-Registration-Interval-VOS3000-Authentication-Retry-Limits-VOS3000-Call-Authentication-Mode-1.png?fit=1200%2C800&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":1631,"url":"https:\/\/multahost.com\/blog\/vos3000-data-maintenance\/","url_meta":{"origin":3445,"position":2},"title":"VOS3000 Data Maintenance &amp; Auto\u2011Cleanup: Important Database Management Guide","author":"king","date":"March 8, 2026","format":false,"excerpt":"VOS3000 data maintenance guide: learn how to manage CDR tables, enable auto\u2011cleanup, optimize database performance, and prevent disk space issues with scheduled purging.","rel":"","context":"In &quot;VOS3000&quot;","block_context":{"text":"VOS3000","link":"https:\/\/multahost.com\/blog\/category\/vos3000\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/vos3000-banners-post.png?fit=1200%2C402&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/vos3000-banners-post.png?fit=1200%2C402&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/vos3000-banners-post.png?fit=1200%2C402&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/vos3000-banners-post.png?fit=1200%2C402&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/vos3000-banners-post.png?fit=1200%2C402&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":710,"url":"https:\/\/multahost.com\/blog\/why-vos3000-server-getting-restarted-daily-auto\/","url_meta":{"origin":3445,"position":3},"title":"Why VOS3000 Server getting restarted daily auto, Know easy Solution","author":"king","date":"September 29, 2025","format":false,"excerpt":"Why VOS3000 Server getting restarted daily auto? 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Configure Auto\/G729\/G729a\/G729&G729a modes in routing gateway additional settings.","rel":"","context":"In &quot;VOS3000&quot;","block_context":{"text":"VOS3000","link":"https:\/\/multahost.com\/blog\/category\/vos3000\/"},"img":{"alt_text":"VOS3000 SIP Authentication, VOS3000 Domain Management, VOS3000 Call Failed Announcement, VOS3000 G729 Negotiation Mode, VOS3000 RTP Encryption","src":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-SIP-Authentication-VOS3000-Domain-Management-VOS3000-Call-Failed-Announcement-VOS3000-G729-Negotiation-Mode-VOS3000-RTP-Encryption-4.png?fit=1200%2C800&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-SIP-Authentication-VOS3000-Domain-Management-VOS3000-Call-Failed-Announcement-VOS3000-G729-Negotiation-Mode-VOS3000-RTP-Encryption-4.png?fit=1200%2C800&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-SIP-Authentication-VOS3000-Domain-Management-VOS3000-Call-Failed-Announcement-VOS3000-G729-Negotiation-Mode-VOS3000-RTP-Encryption-4.png?fit=1200%2C800&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-SIP-Authentication-VOS3000-Domain-Management-VOS3000-Call-Failed-Announcement-VOS3000-G729-Negotiation-Mode-VOS3000-RTP-Encryption-4.png?fit=1200%2C800&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-SIP-Authentication-VOS3000-Domain-Management-VOS3000-Call-Failed-Announcement-VOS3000-G729-Negotiation-Mode-VOS3000-RTP-Encryption-4.png?fit=1200%2C800&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":3152,"url":"https:\/\/multahost.com\/blog\/vos3000-sip-outbound-registration-parameters\/","url_meta":{"origin":3445,"position":5},"title":"VOS3000 SIP Outbound Registration Parameters: Expiry and Retry Delay Easy Guide","author":"king","date":"April 21, 2026","format":false,"excerpt":"Master VOS3000 SIP outbound registration parameters: SS_SIP_USER_AGENT_EXPIRE (Auto Negotiation, 20-7200s) and SS_SIP_USER_AGENT_RETRY_DELAY (30-600s). 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