How SIP hold using RFC6336 is implemented and how it looks in production.
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Tag: SIP
An overview of FreeSWITCH’s ESL
These posts focus on the use of Diameter and SIP in an IMS / VoLTE context, however these practices can be equally applied to other networks. The Registration-Termination Request / Answer allow a Diameter Client (S-CSCF) to indicate to the HSS (Diameter Server) that it is no longer serving that user and the registration has […]
The Diameter User-Authorization-Request and User-Authorization-Answer commands are used as the first line of authorization of a user and to determine which Serving-CSCF to forward a request to.
These posts focus on the use of Diameter and SIP in an IMS / VoLTE context, however these practices can be equally applied to other networks. The Server-Assignment-Request/Answer commands are used so a SIP Server can indicate to a Diameter server that it is serving a subscriber and pull the profile information of the subscriber. […]
These posts focus on the use of Diameter and SIP in an IMS / VoLTE context, however these practices can be equally applied to other networks. The Location-Information-Request/Answer commands are used so a SIP Server query a Diameter to find which P-CSCF a Subscriber is being served by Basics: The RFC’s definition is actually pretty […]
These posts focus on the use of Diameter and SIP in an IMS / VoLTE context, however these practices can be equally applied to other networks. The Multimedia-Authentication-Request/Answer commands are used to Authenticate subscribers / UAs using a variety of mechanisms such as straight MD5 and AKAv1-MD5. Basics: When a SIP Server (S-CSCF) receives a […]
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.
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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