Monthly Archives: December 2013

The Back-to-Back User Agent (B2BUA)

SIP is nothing more than a protocol.  It has request and response messages.  These messages contain headers and headers contain parameters.  Both request and response messages optionally carry a message body.  The message body is typically Session Description Protocol (SDP), but it can be anything you want it to be.  I once helped write a […]

Avaya Call Intercept Services

A few weeks ago I wrote about Avaya’s new Collaboration Environment (CE).  Since then I have had time to download the SDK (Software Development Kit) and spend some time reading through the documentation.  So far, I like what I see.  The Java classes are straightforward and comprehensive in their scope.  I have yet to write […]

Virtual Communications

In my perfect communications world there are no gateways, analog and digital trunk cards, ringtone generators, T1 clock controllers, or any of the other components of a TDM infrastructure.  Everything runs on off-the-shelf servers, using standard operating systems, across an IP network.  Of course, my perfect world is pure SIP and because of some recent […]