An overview of FreeSWITCH’s ESL
Tag: VoIP
Some of the lesser used / utilized features of the SIP REGISTER method.
Running multiple instances of Kamailio on the same server using init.d
Using Transport Layer Security (TLS) to protect SIP traffic from modification / manipulation and guarantee message authenticity.
Lessons learned about setting up VoLTE / IMS Networks at small scale.
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VoLTE / IMS – P-CSCF Assignment
How the P-CSCF address is assigned to a UE in Protocol Configuration Options (PCO) during bearer establishment.
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Automated SIP testing with sipcmd
Using sipcmd to test SIP Services from the command line
A look into Instant Messaging using SIP
Using Kamailio’s UAC module to send outbound SIP REGISTER messages
Using Kamailio UAC module to send a SIP Text Message (MESSAGE) to an administrator when a user dials an emergency services number.
The exchange between a UE and P-CSCF to put SIP traffic into IPsec encapsulated payloads.
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Kamailio Bytes – KEMI Intro
Using KEMI to write routing logic using languages like Python, Ruby, Lua and JS
Viewing the payload of an Encapsulated Security Payload in Wireshark.
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SIP Supported & Require
Function of Supported & Require headers in SIP.
AP, IX, IP & DX – The meaning of Dispatcher states in Kamailio’s Dispatcher module.
Stateless Kamailio SIP proxy example for changing Caller ID values
Robust Header Compression (ROHC) and it’s use for compressing RTP / VoLTE traffic headers.
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Load Testing with SIPp
SIPp (a performance testing tool for SIP) to simulate many concurrent calls leading to many concurrent transcoding sessions.
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Kamailio Bytes – DMQ
Using Kamailio’s Distributed Message Queue to share memory data between Kamailio nodes
Some TM (Transaction Module) use cases in Kamailio