Find out some hard to find information about debugging and troubleshooting VoIP (SIP, MGCP, etc.) problems.
One of the primary techniques is to view what is actually getting sent and received by VoIP devices. Topics covered in this resource are:
Monitor Ethernet Traffic
Debugging displays from a VOIP program
Ethernet Monitoring Tools
Built-in Debug Tools
Decoding VOIP audio streams
Here is the full resource:
http://tinyurl.com/3als2
