[Freeswitch-users] Codec negotiation questions
ivdreg ivdreg
ivdreg at gmail.com
Fri Feb 13 09:50:54 PST 2009
Hi Antony,
Can you tell me why you do codec negotiation like that. I'm just curious. If
you do not have time do not reply me.
Thanks a lot for your help.
2009/2/13 Anthony Minessale <anthony.minessale at gmail.com>
> As i have already answered, no, it does not do what you want automaticly,
> the only way to influence codec negotiation is the way i have described.
>
> parsing the sdp string allows you to set absolute_codec_string going both
> ways.
> if you set it before you answer the channel with late negotiation enabled
> it will influence the codecs accepted on the inbound call.
> it you set it on the b leg either by using export instead of set on the a
> leg or putting it in {} in the dial string it controlls what codecs are
> offered in the outbound invite.
>
>
>
>
> On Fri, Feb 13, 2009 at 10:50 AM, ivdreg ivdreg <ivdreg at gmail.com> wrote:
>
>> Hi Anthony,
>>
>> I'm not sure that you understood the problem. As it shown bellow the
>> offered codec in leg B contains only one codec (first matched in codec
>> preference list for this profile). Is there way to offer in leg B not only
>> first codec but all codecs that exists in INVITE in leg A that matches codec
>> preference list. If not is the only way is to parse SDP and set
>> absolute_codec_string manualy?
>>
>> Regards
>>
>> 2009/2/13 Anthony Minessale <anthony.minessale at gmail.com>
>>
>> yes you are wrong.
>>>
>>> inbound-late-negotiation setting delays the codec negotiation until the
>>> instant audio is needed.
>>> It is not tied to inbound-proxy-media.
>>>
>>>
>>> This allows the call to come into the dialplan before any codec
>>> negotiation is done giving you a chance to look at the SDP before the
>>> negotiation takes place and insert an absolute_codec string essentially
>>> letting you chose unique codec preferences per inbound call.
>>>
>>> >>> Why I should parse variable_switch_r_sdp
>>>
>>> Well....you must parse it because it's you who cares about what it says,
>>> as described above it lets you peek at the sdp and enforce a unique set of
>>> codec prefs per call.
>>>
>>>
>>>
>>>
>>> On Fri, Feb 13, 2009 at 8:57 AM, ivdreg ivdreg <ivdreg at 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 at 32000h
>>>> @20i,speex at 16000h@20i,speex at 8000h@20i,*iLBC at 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 at 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 at 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
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>>>>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
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>>>>>> 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 at hotmail.com<MSN%3Aanthony_minessale at hotmail.com>
>>>>> GTALK/JABBER/PAYPAL:anthony.minessale at gmail.com<PAYPAL%3Aanthony.minessale at gmail.com>
>>>>> IRC: irc.freenode.net #freeswitch
>>>>>
>>>>> FreeSWITCH Developer Conference
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>>>>> iax:guest at conference.freeswitch.org/888
>>>>> googletalk:conf+888 at conference.freeswitch.org<googletalk%3Aconf%2B888 at conference.freeswitch.org>
>>>>> pstn:213-799-1400
>>>>>
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>>>>>
>>>>
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>>>>
>>>
>>>
>>> --
>>> Anthony Minessale II
>>>
>>> FreeSWITCH http://www.freeswitch.org/
>>> ClueCon http://www.cluecon.com/
>>>
>>> AIM: anthm
>>> MSN:anthony_minessale at hotmail.com <MSN%3Aanthony_minessale at hotmail.com>
>>> GTALK/JABBER/PAYPAL:anthony.minessale at gmail.com<PAYPAL%3Aanthony.minessale at gmail.com>
>>> IRC: irc.freenode.net #freeswitch
>>>
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>>>
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>>
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>>
>
>
> --
> Anthony Minessale II
>
> FreeSWITCH http://www.freeswitch.org/
> ClueCon http://www.cluecon.com/
>
> AIM: anthm
> MSN:anthony_minessale at hotmail.com <MSN%3Aanthony_minessale at hotmail.com>
> GTALK/JABBER/PAYPAL:anthony.minessale at gmail.com<PAYPAL%3Aanthony.minessale at gmail.com>
> IRC: irc.freenode.net #freeswitch
>
> FreeSWITCH Developer Conference
> sip:888 at conference.freeswitch.org <sip%3A888 at conference.freeswitch.org>
> iax:guest at conference.freeswitch.org/888
> googletalk:conf+888 at conference.freeswitch.org<googletalk%3Aconf%2B888 at conference.freeswitch.org>
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>
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