[asterisk-dev] IAX Voice Framing

[Stephen Davies]

Hi,
We do use iax trunking quite a bit and definitely one metaframe can
carry multiple frames from the same call.
Use trunktimestamps=yes.

Steve

On 2/7/10, Jared Smith <jsmith at digium.com> wrote:
> On Sat, 2010-02-06 at 23:47 +0200, Stephen Davies wrote:
>> Iax can already do this.  Just enable trunking and increase trunkfreq
>> to 40 or 60 msec or more.
>
> I'm not sure that's quite true.  I remember back in the good ol' days
> when I came up with IAX2 trunking, that John Todd did some testing on it
> with the ILBC codec, which defaults to 30ms between packets, and he
> couldn't get the actual bandwidth to match his calculations.  I did a
> bit of digging myself, and With IAX2 trunking turned on and trunkfreq
> set to 20ms, we found that you'd see one packet sent in the trunk, and
> then the next packet sent outside the trunk, and then the next packet
> sent as part of the trunk again, etc.
>
> I'm guessing the same might happen if you had incoming audio packets
> arriving at 20ms and trunkfreq set to 40ms... that every other audio
> packet would be put in the trunk, and that the other ones might be sent
> outside the trunk.  You'd have to lab this up to make sure, though.
>
> --
> Jared Smith
> Digium, Inc.
>
>
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