Eric Wieling
2005-Feb-19 00:30 UTC
[Asterisk-Users] Understanding and Troubleshooting Analog E&M
For the Archives. This document discusses analog recEive and transMit (E&M) Start Dial Supervision signaling. Start Dial Supervision is the line protocol that defines how the equipment seizes the E&M trunk and passes the address signaling information (sends dual tone multifrequency (DTMF) digits). The three main start dial supervision protocols used on E&M circuits are Immediate Start, Wink Start, and Delay Dial. http://www.cisco.com/warp/public/788/signalling/em-supervision.html