SIPit – interoperability tests that bring VoIP forward: #28 completed!
SIPit 28 was hosted by Digium in Huntsville, Alabama, USA the week of April 11-15, 2010. There were 54 attendees from 19 companies visiting from 10 countries, using 40 distinct implementations in the...
View ArticleSplices – how to manage multiple media sessions
Imagine working at your desk, getting a phone call from your friend Randy. You answer on your IP phone. Being Randy, he suddenly wants to play a new jingle he created while being in the mood the day...
View ArticleVoice 3.0: Let’s make it secure by default!
Alec Saunders has written a new manifesto called “Voice 3.0: The emergence of the Voice Web“. It’s very good reading and I agree with most of it. Please read it! What I am missing, which you will see...
View ArticleBuilding the realtime web – now with realtime multimedia
Video sessions in the browser opens up for a lot of new applications. While this has been working with various plugins, new opportunities will open up when it becomes part of your standard web browser....
View ArticleThis year’s Voip2day presentation: Watch out! The SIP world is changing!
Last week I talked at the Voip2Day conference in Madrid, organized by Avanzada7. The talk, named “Watch out!” covers new areas developed in SIP, but not implemented in many devices or servers out...
View ArticleSMS via SIP MESSAGE requires TLS and S/MIME – who knew?
I’m currently swimming through the deep waters of SIP RFCs in order to get an overview of TLS implementation requirements. Reading RFC 3428 – The SIP Message Extension- I found something I did not...
View ArticleTesting dual stacks – something we need to do for SIP software
Yesterday I found an Internet Draft called Testing Eyeball Happiness that gives examples on how to test dual stack deployments. There is a known issue with applications that retrieves multiple IP...
View ArticleSIP and security: Clarifications and specifications needed
Lately, I’ve been going through a lot of SIP RFCs and drafts, trying to get an overview of the security suggested in all of these documents. The quality of this work, seen from a developer’s...
View ArticleKeeping the SIP connection open – RFC 5923
In a SIP network, you often have multiple servers communicating with each other. As soon as you add TCP and TLS to the mix, you will want to reuse connections. Why? Setting up A TLS connection involves...
View ArticleSIP ten years later – much more than RFC 3261
RFC 3261, The Session Initiation Protocol, was published in 2002, six years after the initial work on SIP. Wikipedia writes “SIP was originally designed by Henning Schulzrinne and Mark Handley in 1996....
View Article
