Stateless, Stateful, Dialog Stateful and Transaction Stateful SIP Proxies
Nick SIP Proxy types, such as Stateless & Stateful explained, with examples.
2019
Kamailio Bytes – Dialplan Module
Using Kamailio's dialplan module to run transformations on variables.
SIP Extensions – 100rel SIP (RFC3262)
When a final response, like a 200 OK, or a 404, etc, is sent, the receiving party acknowledges that it received this with an ACK. By provisional responses, such as…
Kamailio Bytes – Dispatcher Module
Using the Dispatcher Module for load balancing functionality and intelligent dispatching of SIP messages.
PMG / Erricson 3 line 8 ext PMBX
It’s no great secret I collect old phone stuff, I got this Melbourne made PMBX (Private Manual Branch Exchange) a while back, and I finally got around to doing something…
IBM Watson – Speech to Text (SST)
Using Watson for Speech to Text transcription of Call Audio for Telephony applications
ASN.1 Encoding in a Nutshell
Introduction to Encoding & Decoding data in ASN.1 (Using Python)
Kamailio 101 – Part 10 – Recap
Recap of the series
Kamailio 101 – Part 9 – Adding Carrier Links
Adding Trunks to our Kamailio instance to make / receive calls from the PSTN.
Message Amplification & UDP Flooding with SIP
DNS style message amplification using SIP requests to flood a server / host.
All About IMS Authentication (AKAv1-MD5) in VoLTE Networks
How the AKAv1-MD5 algorith derives keys and how it's used in IMS Networks
RTP – More than you wanted to know
Workhorse of VoIP / VoLTE / SIP / H.323 / IMS, we take a deep dive into what every bit of RTP means. Pun very much intended.
Kamailio 101 – Part 8 – Security in Practice
Putting security into practice in Kamailio to authenticate INVITE and REGISTER traffic by source IP and Challenge / Response in the Auth header.
Kamailio 101 – Part 7 – Security in Theory
General overview of AAA, traffic validation and SIP security.