The problem is that RFC 3261 that defines SIP has become "everything to everyone" and bloated in both size and in flexibility. For those of you that have deployed SIP-based solutions or SIP Trunking, ...

Secure SIP is a security mechanism defined by SIP RFC 3261 for sending SIP messages over a Transport Layer Security-encrypted channel. Originally used for securing HTTP sessions, TLS can be repurposed ...

In this chapter, we start putting into practice some of the SIP concepts learned so far. We will show some very simple programming examples that illustrate how SIP works. As was stated in previous ...

In our last VoIP installment, we looked at the main reasons why SIP has become a widely adopted protocol, but we left details of the protocol’s inner workings fairly vague. This article will drill ...

This is the sixth and last in a series of newsletters devoted to the standards process. We will use this newsletter to wrap up the discussion of standards by looking at Session Initiation Protocol. We ...

GLEN ROCK, N.J. — Radvision is looking to make the development of voice-over-IP (VoIP) systems today with the release of an upgraded session initiation protocol (SIP) software toolkit and test suite.

Let's move past the technical issues and talk about a far more difficult challenge--the politics of SIP Interoperability. Earlier this week I shared with you a few thoughts on SIP Interoperability, ...