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Understanding SIP routing
Numerous trouble tickets leading to session timeouts or disconnections often stem from SIP routing errors. SIP routing, is the process to determine the destination for SIP requests (e.g.…
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Using VSXi sslkeylog
Version 10.7.1.x introduced support for SSLKeyLog. SSLKeylog allows you to log encryption keys used in TLS connections, making it easier to troubleshoot encrypted traffic.…
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VSXi SIP Session Timers
Contents VSXi SIP Session Timers Configuration Troubleshooting problems Case 1: 408 refresh failure CDR Case 2: Issue handling UPDATE Method causes call drop Case 3:…
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Fax T.38 troubleshooting guide
Faxing is an application that relies on a variety of parameters and can sometimes become tricky to troubleshoot. This article covers common cases to help you troubleshoot why your faxes are failing.…
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Frequently asked questions
Contents Configuration VoIP 420 Unsupported Extension on Blocked Caller-ID Calls VSXi is not alternate routing System Administration CDRs contain trailing whitespace GUI is displaying a blank page…
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Using sngrep tracing tool
sngrep is a tool for capturing and displaying SIP traffic. Think of sngrep as a SIP-oriented tshark/tcpdump. sngrep supports the following features: Use a matching expression to capture data.…
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CDR troubleshooting guide
Contents Overview How to find the CDR of a call CDR fields at a glance Common Release Causes 504 INVITE Response Timeout 504 SIP Resend Timeout 408 Refresh Failure 200 OK Timeout 999 EAM Routing…
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SIP Stats troubleshooting
Contents SIP Stats Troubleshooting Global statistics Error statistics SIP Stats Troubleshooting The SIP Stats page located under the main Monitoring tab provides invaluable information about…
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"Not Authorized" Failed Calls
This document provides general guidelines to troubleshoot calls rejected with “Not Authorized” release cause. Unauthorized calls are generated by unknown sources sending traffic,…
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VSXi call states timeouts
The VSXi has several call state timeouts that can be configured on a per-resource basis. No Ring Timeout Ring No Answer Timeout INVITE Response Timeout Maximum Call Duration No Ring Timeout When an…
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Decrypting SRTP stream from a PCAP
Note: This is an advanced document for advanced users able to compile open source software in a Linux operating system and knowledge of packet capture analysis, SIP/SDP and SRTP.…
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Decrypting SIP/TLS packets using Wireshark
You will need to follow these steps if you are trying to configure Wireshark (or a similar packet capture appliance) to decode encrypted SIP messages using TLS.…
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VSXi SIP Tracing Capabilities
In addition to packet traces via Tshark, the VSXi is able to record signaling messages to a log file via the SIP Trace module. This is great troubleshooting tool for issues that are not easily…
Stuck? This section covers common issues and how to troubleshoot them.