Fax passthrough – unlimited!!

Posted: May 27, 2006 by sankar in Analog, Cisco General, Fax

What is Fax passthrough ?

Fax passthrough encodes fax traffic with in a g711 voice codec and sends it across the voip network as a voice call. The call may use any codec (g711, g729, g723) etc initially and once a 2100 Hz CED tone is detected, the device (ATA for ex:) tells the far end gateway to switch over to G711 using a peer-to-peer message. This message is called a NSE message (Named Signalling Event) with in the RTP stream.


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