[Freeswitch-users] Codec negotiation with carriers

[Michael Collins]

You may want to read up on codec negotiation:
http://wiki.freeswitch.org/wiki/Codec_negotiation

There are different ways to handle codecs depending on your needs. I'd read
that page first and then try out some of the suggestions. If you're still
having trouble then I'd recommend getting SIP traces of the traffic and
putting them on pastebin.freeswitch.org. The gang here is pretty good at
looking over logs and helping with diagnosing problems. :)

-MC

On Tue, Mar 6, 2012 at 2:30 PM, Anto <potxoka at gmail.com> wrote:

> Hi
>
> I am following the steps in this direction
> "http://wiki.freeswitch.org/wiki/SBC_Setup" and
> "http://wiki.freeswitch.org/wiki/Provider_Configuration:_Broadvoice",
> I reread the whole entire wiki (or so I lack), but do not quite
> assimilate or finding the right formula to operate the bridge :-S.
>
> I captured traffic with ngrep, I enabled sip-trace, console logconsole
> 8, etc., but unless the transcoding error (only two of the hundreds of
> combinations of settings that I have), I have not seen anything
> "weird" :-S
>
> I have 3 suppliers, each with this codec:
>
> 1)           2)              3)
> G729        G729        G729
> G711u      G711A      G711A
> G711A     G711u       G711u
>                G723         G723
>                                  G722
>                                  GSM
>
> I think I understand that when making an outside call, FreeSWITCH
> follow these steps:
>
> USER -> (   Dialplan -> profile (internal) -> bridge (external) ->
> profile (external)   ) -> PROVIDER
>
> PROVIDER -> (   Dialplan -> profile (external) -> bridge (internal) ->
> profile (internal)  ) -> USER
>
> right?
>
> Internal and external I set as follows (and not many changes have
> done, and not remember it, because I've been testing days). If
> outbound (outbound-codec-prefs) all codecs specified system does not
> handle the call, I have to specify these by hand. If active
> inbound-proxy-media, not the caller. Some of the time I worked, but
> gave me an error that it can do transcoding G729 codec (I do
> passthrough), but the proxy does not work half.
>
> If the outbound property (outbound-codec-prefs) all codecs specified
> system does not handle the call, I have to specify these by hand. If
> active inbound-proxy-media, not the caller. Some of the time I worked,
> but gave me an error that it can do transcoding G729 codec (I want to
> make passthrough), but the "proxy media" does not work.
>
> Basically, what I do is that local users can use all the codecs
> allowed (iLBC, GSM, ...) and make an outside call, use the carrier
> that will indicate the priority but the free codec.
>
> With this configuration works for me, but I would like to understand
> why so if it works and otherwise no. Coming to understand how to
> configure properly and so as not to disturb the mail list ;-). Thanks
> !
>
> Best regards
> Anto
>
> vars.xml
>
> <X-PRE-PROCESS cmd="set"
>
> data="global_codec_prefs=iLBC,G7221,speex,PCMU,PCMA,BV16,G726-32,GSM,G729,G723,AMR"/>
> <X-PRE-PROCESS cmd="set"
>
> data="carriers_codec_prefs=PCMU,PCMA,G729,G723,AMR,iLBC,G7221,speex,BV16,G726-32,GSM"/>
>
> internal.xml
>
> <param name="codec-prefs" value="$${global_codec_prefs}"/>
> <!--param name="inbound-codec-prefs" value="$${global_codec_prefs}"/>
> <param name="outbound-codec-prefs" value="$${global_codec_prefs}"/-->
> <!--param name="inbound-codec-negotiation" value="generous"/-->
> <param name="inbound-codec-negotiation" value="greedy"/>
> <param name="inbound-late-negotiation" value="true"/>
> <param name="renegotiate-codec-on-reinvite" value="true"/>
> <!--param name="inbound-proxy-media" value="true"/-->
>
> external.xml
>
> <param name="codec-prefs" value="$${carriers_codec_prefs}"/>
> <param name="inbound-codec-prefs" value="$${carriers_codec_prefs}"/>
> <!--param name="outbound-codec-prefs" value="$${carriers_codec_prefs}"/-->
> <param name="outbound-codec-prefs" value="PCMU,PCMA,G729,G723"/>
> <!--param name="inbound-codec-negotiation" value="generous"/-->
> <param name="inbound-codec-negotiation" value="greedy"/>
> <param name="inbound-late-negotiation" value="true"/>
> <param name="renegotiate-codec-on-reinvite" value="true"/>
> <!--param name="inbound-proxy-media" value="true"/-->
>
> dialplan/outbound.xml
>
> <include>
>        <context name="internal">
>                <extension name="outbound">
>                  <condition field="destination_number"
> expression="^(\d+)$">
>                        <!--action application="set"
> data="inherit_codec=true"/-->
>                        <!--action application="set"
> data="hangup_after_bridge=true"/-->
>                        <!--action application="set"
> data="proxy_media=true"/-->
>                        <action application="bridge"
> data="sofia/gateway/provider-2/$1"/>
>                  </condition>
>                </extension>
>        </context>
>
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>
> 
> 
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