On 04/07/2004, at 11:24 PM, Deon Rodden wrote:
Sorry, I've been on voip-info.org but I still can't get a clear definition
of what IAX trunking is. It says you need the timing from a zaptel device
(or ztdummy or zaprtc) to make it work, but nothing specific about what it
is or what it does. Maybe I'm looking in the wrong place.
The best place to look is:
http://www.voip-info.org/wiki-Asterisk+bandwidth+iax2
But in a nutshell - IAX trunking allows multiple voice streams to share a single "trunk" to another server, reducing overhead created by IP packets.
"This trunking eliminates the IP overhead found in individual VoIP IP streams by pipelining RTP data from multiple calls into single (larger) packets, thus removing the redundancy of IP overhead for each RTP stream and more closely allowing bandwidth scaling as a function of codec usage instead of a function of (codec usage + IP overhead.) Of course, this mode can only be used if all the calls are between two specific Asterisk servers, but this is frequently the case with toll-avoidance situations or between two branch offices where there is an Asterisk server at each location. "
Andrew
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