On Mar 29, 2012, at 08:43 , Deepesh D wrote:> What are the different type of bridging used by asterisk in a SIP
> call? What is the difference between Packet2Packet bridging, Remote
> bridging and Native bridging?
Packet2Packet bridging is when RTP datagrams are forwarded by Asterisk without
modification. This imposes little load on the CPU. Obviously this can only
happen if both ends are using the same codec, and likely there are likely other
less obvious conditions that must be met.
Remote bridging happens when Asterisk can direct both ends to send media (RTP
probably) to each other directly, by a SIP reINVITE, for example. Only works if
both ends have a route to each other, Asterisk is configured to do it, each end
shares a codec, and probably a dozen other more subtle conditions are true. In
this case there is no load on Asterisk as it's not even in the media path.
It also means it can't do things like intercept and act on DTMF or monitor
the call.
Native bridging is when media is forwarded with Asterisk, but for whatever
reason (different codecs, maybe) Asterisk must inspect or modify the stream.
Could mean a significant CPU load.
--
Phil Frost
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