Summary:	ASTERISK-06403: Codec order is not working ok
Reporter:	Alvaro Palma (alvaro_palma_aste)	Labels:
Date Opened:	2006-02-23 08:37:02.000-0600	Date Closed:	2011-06-07 14:10:12
Priority:	Minor	Regression?	No
Status:	Closed/Complete	Components:	Core/CodecInterface
Versions:		Frequency of Occurrence
Related Issues:
Environment:		Attachments:
Description:	I'm communicating a softphone (SJPhone) to a Grandstream phone GXP-2000. The codec order on each one is the next: SJPhone: GSM - iLBC - PCMA - PCMU GXP2000: G729 - GSM - PCMA - PCMU (I have a G729 license, so there's no problem with transcoding G729) In my sip.conf, I've defined the following codec order: disallow=all allow=g729 allow=gsm allow=g726 allow=alaw allow=ulaw And my peers shows this order correctly: Codecs       : 0x11e (gsm|ulaw|alaw|g726|g729) Codec Order  : (g729,gsm,g726,alaw,ulaw) Canreinvite is set to NO. But, if I initiate a call from the softphone to GXP-2000, Asterisk always to the GXP phone GSM as the first codec choice, instead of G729, as I could check with ethereal running in the same server than Asterisk. The SIP INVITE from Asterisk to GXP looks like ***************************************************************** Request-Line: INVITE sip:5805907@192.168.1.105;user=phone SIP/2.0 Message Header Message body    Session Description Protocol        Session Description Protocol Version (v): 0        Owner/Creator, Session Id (o): root 27682 27682 IN IP4 192.168.1.2        Session Name (s): session        Connection Information (c): IN IP4 192.168.1.2        Time Description, active time (t): 0 0        Media Description, name and address (m): audio 14224 RTP/AVP 3 18 111 8 0            Media Type: audio            Media Port: 14224            Media Proto: RTP/AVP            Media Format: GSM 06.10            Media Format: ITU-T G.729            Media Format: 111            Media Format: ITU-T G.711 PCMA            Media Format: ITU-T G.711 PCMU        Media Attribute (a): rtpmap:3 GSM/8000            Media Attribute Fieldname: rtpmap            Media Attribute Value: 3 GSM/8000        Media Attribute (a): rtpmap:18 G729/8000            Media Attribute Fieldname: rtpmap            Media Attribute Value: 18 G729/8000        Media Attribute (a): fmtp:18 annexb=no            Media Attribute Fieldname: fmtp            Media Attribute Value: 18 annexb=no        Media Attribute (a): rtpmap:111 G726-32/8000            Media Attribute Fieldname: rtpmap            Media Attribute Value: 111 G726-32/8000        Media Attribute (a): rtpmap:8 PCMA/8000            Media Attribute Fieldname: rtpmap            Media Attribute Value: 8 PCMA/8000        Media Attribute (a): rtpmap:0 PCMU/8000            Media Attribute Fieldname: rtpmap            Media Attribute Value: 0 PCMU/8000        Media Attribute (a): silenceSupp:off - - - -            Media Attribute Fieldname: silenceSupp            Media Attribute Value: off - - - - ***************************************************************** So it can be clearly seen how GSM is before G729.
Comments:	By: Serge Vecher (serge-v) 2006-02-23 08:59:50.000-0600 alvaro: there is a new codec negotiation algorithm that is being developed in http://bugs.digium.com/view.php?id=4825. Please test the latest patch there to see if it helps your cause. By: Olle Johansson (oej) 2006-04-04 08:50:41 Well, that is the order coded inside Asterisk. GSM is preferred if you allow that.