[asterisk-dev] IAX Voice Framing

[Stephen Davies]

Iax can already do this.  Just enable trunking and increase trunkfreq
to 40 or 60 msec or more.

On 2/5/10, Tilghman Lesher <tlesher at digium.com> wrote:
> On Friday 05 February 2010 13:31:16 Manivasagam Sivaraman wrote:
>> I'm trying to pack 3 or 4 audio voice frames into one IAX audio packet and
>> send it out. The receiving end will also be the same asterisk that would
>> expect the 3 or 4 voice frame in one IAX audio packet. Before touching the
>> code I want to know if this is feasible. I'm new to asterisk and I want to
>> have a heads up before I begin. Please let me know if there will be some
>> risk involved in this. I see a function in frame.h that allows framing of
>> multiple voice frames in one RTP packet for instance in sip and h323
>> channels. However no such function is used in chan_iax2.c file. Could you
>> please expalin why ? Why iax channel is coded a bit different ?
>
> Clearly, because the IAX channel does not use RTP.  This is a feature, which
> helps IAX to more cleanly go through NATs, and it may work in places where
> SIP does not, such as double and triple NAT situations.
>
> I really don't understand why you'd want to pack multiple frames into a
> single
> packet.  That increases latency, which for a real time protocol is rather
> bad.
>
> --
> Tilghman Lesher
> Digium, Inc. | Senior Software Developer
> twitter: Corydon76 | IRC: Corydon76-dig (Freenode)
> Check us out at: www.digium.com & www.asterisk.org
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