On Fri, Feb 13, 2009 at 8:57 AM, ivdreg ivdreg <ivdreg@gmail.com> wrote:

Hi Anthony,

Excuse me if I'm wrong but inbound-late-negotiation must be used proxy_media as I see in documentation. I don't want to proxy media because of some issues with MOH or 3-way conferencing. Also I want to exclude media codecs that are supported only in pass-trough mode. Let mi give you an example:

SDP from caller

   v=0
   o=- 1 2 IN IP4 192.168.20.193
   s=CounterPath eyeBeam 1.5
   c=IN IP4 192.168.40.81
   t=0 0
   m=audio 56888 RTP/AVP 100 106 97 105 98 3 101
   a=fmtp:101 0-15
   a=rtpmap:100 SPEEX/16000
   a=rtpmap:106 SPEEX-FEC/16000
   a=rtpmap:97 SPEEX/8000
   a=rtpmap:105 SPEEX-FEC/8000
   a=rtpmap:98 iLBC/8000
   a=rtpmap:101 telephone-event/8000
   a=sendrecv
   a=x-rtp-session-id:61940567309B49E8909127E1393A966E
   m=video 46378 RTP/AVP 125 115 34
   a=fmtp:125 profile-level-id=42e015; max-br=4000; max-mbps=19800
   a=fmtp:115 QCIF=1 MAXBR=4520
   a=fmtp:34 QCIF=1 MAXBR=4520
   a=rtpmap:125 H264/90000
   a=rtpmap:115 H263-1998/90000
   a=rtpmap:34 H263/90000
   a=sendrecv
   a=x-rtp-session-id:E8244E608F65445BA183BBE641C5DF3C
   a=nortpproxy:yes

SDP from Freeswitch to called

   v=0
   o=FreeSWITCH 6228154995644782318 4633980766357417433 IN IP4 10.10.10.10
   s=FreeSWITCH
   c=IN IP4 10.10.10.10
   t=0 0
   m=audio 26920 RTP/AVP 3 101 13
   a=rtpmap:3 GSM/8000
   a=rtpmap:101 telephone-event/8000
   a=fmtp:101 0-16
   a=rtpmap:13 CN/8000
   a=ptime:20

So we offer only first in codec preference list

from called wich is normal receives
   SIP/2.0 488 Not Acceptable Here
called suports - PCMA,PCMU,iLBC

Codec preference to this vars.xml we have witch is used in provile:
<X-PRE-PROCESS cmd="set" data="all_codec_prefs=GSM,speex@32000h@20i,speex@16000h@20i,speex@8000h@20i,iLBC@30i,PCMA,PCMU,G729"/>
also we have in profile:
<param name="inbound-codec-negotiation" value="greedy"/>
<param name="disable-transcoding" value="true"/>
In dialplan I've set:
<action application="set" data="inbound-late-negotiation"/>
<action application="set" data="inherit_codec=true"/>

About my second question:
Why I should parse variable_switch_r_sdp: [v=0
o=- 6 2 IN IP4 192.168.20.193
s=CounterPath eyeBeam 1.5
c=IN IP4 192.168.40.81
t=0 0
m=audio 60642 RTP/AVP 100 106 97 105 98 3 101
a=rtpmap:100 SPEEX/16000
a=rtpmap:106 SPEEX-FEC/16000
a=rtpmap:97 SPEEX/8000
a=rtpmap:105 SPEEX-FEC/8000
a=rtpmap:98 iLBC/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=x-rtp-session-id:0674790128EB43ACB8C7F55829BCFF14
m=video 44938 RTP/AVP 125 115 34
a=rtpmap:125 H264/90000
a=fmtp:125 profile-level-id=42e015; max-br=4000; max-mbps=19800
a=rtpmap:115 H263-1998/90000
a=fmtp:115 QCIF=1 MAXBR=4520
a=rtpmap:34 H263/90000
a=fmtp:34 QCIF=1 MAXBR=4520
a=x-rtp-session-id:D1EAE543055746AC9C03006B91ADE6DF
a=nortpproxy:yes
]
In FS core this parse is already done I'm sure in much more intelligent way. It can be exported as a variable like a absolute codec string I think.

Thanks again.

2009/2/12 Anthony Minessale <anthony.minessale@gmail.com>

the entire sdp is available as a variable (route the call to the info app to see the variables)
so if you have inbound-late-negotiation set to true on the sip profile
then you can use a regex or a script to set absolute_codec string before you answer.

On Thu, Feb 12, 2009 at 8:06 AM, ivdreg ivdreg <ivdreg@gmail.com> wrote:

Hi all,

Can I ask 2 questions about codec negotiation:

1. Is it possible Freeswitch to work negotiate codecs between two phones as it is described below.
INVITE from A with some codecs in SDP ---> Freeswitch rewrites codec preference according absolute_codec_string but exclude all codecs not offered by A ----> INVITE to B with rewrited SDP.

example:
from A SDP:PCMA,PCMU,SPEEX ----> absolute_codec_string=G722,
PCMU,PCMA,GSM ----> to B SDP: PCMU,PCMA

2. Can I get codec list in INVITE with mod_perl for example or via xml_curl without processing SDP variable (switch_r_sdp). It will be useful to be in format that absolute_codec_string variable takes.

Thanks

_______________________________________________
Freeswitch-users mailing list
Freeswitch-users@lists.freeswitch.org
http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
http://www.freeswitch.org

--
Anthony Minessale II

FreeSWITCH http://www.freeswitch.org/
ClueCon http://www.cluecon.com/

AIM: anthm
MSN:anthony_minessale@hotmail.com
GTALK/JABBER/PAYPAL:anthony.minessale@gmail.com
IRC: irc.freenode.net #freeswitch

FreeSWITCH Developer Conference
sip:888@conference.freeswitch.org
iax:guest@conference.freeswitch.org/888
googletalk:conf+888@conference.freeswitch.org
pstn:213-799-1400

_______________________________________________
Freeswitch-users mailing list
Freeswitch-users@lists.freeswitch.org
http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
http://www.freeswitch.org

_______________________________________________
Freeswitch-users mailing list
Freeswitch-users@lists.freeswitch.org
http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
http://www.freeswitch.org