[asterisk-users] Can't get G.726 to work.

[Chris Maciejewski]

Hi Kevin,

Thanks for your reply. I switched to G726 32Kbps but still no luck:

INVITE....
[SIP headers omitted]

v=0
o=10000 1291673978 653998617 IN IP4 192.168.7.55
s=-
c=IN IP4 78.105.1.131
t=0 0
m=audio 8002 RTP/AVP 104 101
a=rtpmap:104 G726-32/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=ptime:20

Console SIP debug output:

[May 22 16:48:20] DEBUG[6071]: chan_sip.c:4222 do_setnat: Setting NAT
on RTP to Off
Found RTP audio format 104
Found RTP audio format 101
Peer audio RTP is at port 78.105.1.131:8002
Found audio description format G726-32 for ID 104
Found audio description format telephone-event for ID 101
Got unsupported a:fmtp in SDP offer
Capabilities: us - 0x100f (g723|gsm|ulaw|alaw|g722), peer -
audio=0x800 (g726)/video=0x0 (nothing)/text=0x0 (nothing), combined -
0x0 (nothing)
Non-codec capabilities (dtmf): us - 0x1 (telephone-event), peer - 0x1
(telephone-event), combined - 0x1 (telephone-event)
[May 22 16:48:20] NOTICE[6071]: chan_sip.c:7495 process_sdp: No
compatible codecs, not accepting this offer!

I note "Got unsupported a:fmtp in SDP offer"

from RFC 2327:
   a=fmtp:<format> <format specific parameters>
       This attribute allows parameters that are specific to a
       particular format to be conveyed in a way that SDP doesn't have
       to understand them.  The format must be one of the formats
       specified for the media.  Format-specific parameters may be any
       set of parameters required to be conveyed by SDP and given
       unchanged to the media tool that will use this format.

       It is a media attribute, and is not dependent on charset.

Is Twinkle sending this SDP incorrectly? Or some other issue?

Thanks
Chris


2009/5/22 Kevin P. Fleming <kpfleming at digium.com>:
> Chris Maciejewski wrote:
>
>> Found unknown media description format G726-16 for ID 102
>
> It's right there.
>
>> And asterisk is replying with "488 Not acceptable here"
>
> Asterisk does not support G726-16, it only supports G726-32.
>
> --
> Kevin P. Fleming
> Digium, Inc. | Director of Software Technologies
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> skype: kpfleming | jabber: kpfleming at digium.com
> Check us out at www.digium.com & www.asterisk.org
>
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