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Thursday, August 18, 2011

Asterisk Native Bridge vs SIP External Native Bridge

The difference can be illustrated by below scenario:
  1. Dial creates an outbound PBX channel and asks one of the channel drivers to create a call
  2. When the call is answered, Asterisk bridges the media streams so the caller on the first channel can speak with the callee on the second, outbound channel
  3. In some cases where we have the same technology on both channels and compatible codecs, a native bridge is used. In a native bridge, the channel driver handles forwarding of incoming audio to the outbound stream internally, without sending audio frames through the PBX.
  4. In SIP, theres an "external native bridge" where Asterisk redirects the endpoint, so audio flows directly between the caller's phone and the callee's phone. Signalling stays in Asterisk in order to be able to provide a proper CDR record for the call.


The above information is taken from http://www.asterisk.org/doxygen/asterisk1.4/index.html.
 

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