[asterisk-users] Codec preference

[Prince Singh]

Post your Asterisk's sip.conf

On Thu, Mar 11, 2010 at 10:39 PM, jonas kellens <jonas.kellens at telenet.be>wrote:

>  How can I set the prefered codec between 2 calling parties ??
>
> My Grandstream supports *G729, alaw and gsm*... in this order.
> The Zoiper softphone has *alaw and gsm* as codecs... in that order.
>
> Although there should be a matching codec found, my Grandstream can not
> call the Zoiper softphone.
>
> CLI shows :
>
> [Mar 11 17:47:21] WARNING[22367]: channel.c:3340
> ast_channel_make_compatible: No path to translate from
> SIP/mygrandstream-09c599e0(2) to SIP/zoiper-09cd57f8(256)
> [Mar 11 17:47:21]     -- Got SIP response 415 "Unsupported Media Type" back
> from 192.168.1.106 (<-- zoiper)
>
> SIP debug :
>
> [Mar 11 17:55:57] Peer audio RTP is at port 192.168.1.101:10110 (<-- the
> Grandstream)
> [Mar 11 17:55:57] Found audio description format PCMA for ID 8
> [Mar 11 17:55:57] Found audio description format GSM for ID 3
> [Mar 11 17:55:57] Found audio description format PCMU for ID 0
> [Mar 11 17:55:57] Found audio description format G729 for ID 18
> [Mar 11 17:55:57] Found audio description format telephone-event for ID 101
> [Mar 11 17:55:57] Capabilities: us - 0x10a (gsm|alaw|g729), peer -
> audio=0x10e (gsm|ulaw|alaw|g729)/video=0x0 (nothing), combined - 0x10a
> (gsm|alaw|g729)
> [Mar 11 17:55:57] Non-codec capabilities (dtmf): us - 0x1
> (telephone-event), peer - 0x1 (telephone-event), combined - 0x1
> (telephone-event)
> ...
> [Mar 11 17:55:57] Audio is at 192.168.1.150 port 11586 (<-- my Asterisk)
> [Mar 11 17:55:57] Adding codec 0x100 (g729) to SDP
> [Mar 11 17:55:57] Adding non-codec 0x1 (telephone-event) to SDP
>
> This is what Asterisk sends to the Zoiper in the INVITE (sdp) :
>
> Content-Type: application/sdp
> Content-Length: 263
> v=0
> o=root 3208 3208 IN IP4 192.168.1.150
> s=session
> c=IN IP4 192.168.1.150
> t=0 0
> m=audio 11586 RTP/AVP 18 101
> a=rtpmap:18 G729/8000
>
> Why isn't Asterisk negotiating with the Zoiper for the alaw-codec ??
>
> The sip-configuration (realtime MySQL) for the Grandstream is :
>
> allow : *g729;alaw;gsm*
>
> and the Zoiper softphone :
>
> allow : *alaw;gsm;g729*
>
>
> Kind regards,
>
> Jonas.
>
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-- 
Regards,
Prince Singh

Drishti-Soft Solutions Pvt Ltd
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