Annex A is just an alternative way of encoding the data, using less processing power but at poorer quality. They generate compatible data - decoders both with and without annex a support decode both G729 and G729A encoded data. The difference is purely in the implementation of the encoder/decoder. If your device uses G729A in the SDP, it's broken.

Annex B uses the same PT & name. It does work in passthrough mode, as does plain G729.

-Steve


On 8 February 2011 15:31, curriegrad2004 <curriegrad2004@gmail.com> wrote:
G729 only. No A's or AB.

If you want to pass through other variants of G.729, you can simply
modify mod_g729.c to include additional variants of G729

Which by the way, I've pasted the area of the code you might want to
modify. I've done this on mine and it worked fine as pass through.

00217         SWITCH_ADD_CODEC(codec_interface, "G.729A");
00218         for (count = 12; count > 0; count--) {
00219                 switch_core_codec_add_implementation(pool,
codec_interface,
00220
                       SWITCH_CODEC_TYPE_AUDIO, 18, "G729A", NULL,
8000, 8000, 8000,
00221
                       mpf * count, spf * count, bpf * count, ebpf *
count, 1, count * 10,
00222
                       switch_g729_init, switch_g729_encode,
switch_g729_decode, switch_g729_destroy);
00223         }


On Tue, Feb 8, 2011 at 7:02 AM, Sam <u2nsam@gmail.com> wrote:
> Hi,
>
> Which type of  G.729 codec does freeswitch uses in passthrough mode ?
> Is it g729a or g729b or g729ab .
>
> Regards
> Sam
>
>
>
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