Kamailio Bytes – SIP UAC Module to act as a UAC / SIP Client
Nick Using Kamailio UAC module to send a SIP Text Message (MESSAGE) to an administrator when a user dials an emergency services number.
VoIP
IMS / VoLTE IPsec on the Gm Interface
The exchange between a UE and P-CSCF to put SIP traffic into IPsec encapsulated payloads.
Kamailio Bytes – KEMI Intro
Using KEMI to write routing logic using languages like Python, Ruby, Lua and JS
Using Wireshark to peer inside IPsec ESP VoLTE data from the P-CSCF
Viewing the payload of an Encapsulated Security Payload in Wireshark.
SIP Supported & Require
Function of Supported & Require headers in SIP.
Kamailio Bytes – Configuring Diameter Peers with CDP
Introducing C Diameter Peer module in Kamailio to manage Diameter Peers, monitor their state and handle the connections.
Kamailio Bytes – Dispatcher States
AP, IX, IP & DX - The meaning of Dispatcher states in Kamailio's Dispatcher module.
Kamailio Bytes – Rewriting SIP Headers (Caller ID Example)
Stateless Kamailio SIP proxy example for changing Caller ID values
VoLTE/IMS Debugging on Samsung Handsets using Sysdump & Samsung IMS Logger
Unlocking the built in IMS Debugging tool in Samsung's Sysdump Utility
Anatomy of Local Number Portability in Australia
What goes on in the background with Local Number Porting in Australia
The case for Header Compression in VoIP/VoLTE
Robust Header Compression (ROHC) and it's use for compressing RTP / VoLTE traffic headers.
Load Testing with SIPp
SIPp (a performance testing tool for SIP) to simulate many concurrent calls leading to many concurrent transcoding sessions.
Kamailio Bytes – DMQ
Using Kamailio's Distributed Message Queue to share memory data between Kamailio nodes
Kamailio Bytes – Transaction Module
Some TM (Transaction Module) use cases in Kamailio
Transaction Stateful Proxy with Kamailio
Basic example of a Transaction Stateful SIP Proxy in Kamailio
SIP SDP – ptime
SDPs ptime values, what it means, how it can go wrong and how to fix it.
Kamailio vs Asterisk
Comparison on Asterisk and Kamailio and where they fit in the Telephony landscape.
Kamailio Bytes – SDP Manipulation with SDPops
Manipulating SDP with Kamailio
SIP Extensions – Path
In vanilla RFC3261 SIP, a UA can only send a REGISTER request to a SIP Registrar. It can’t go via any intermediary proxies. That’s obviously a bit of a problem,…
Virtualized Transcoding Dimensioning
Load testing a standard VM to see how many RTPengine transcoding sessions it can manage concurrently