[Freeswitch-users] How to configure g729 pass though on Freeswitch

[David Ponzone]

As far as I know, you can't, because T38 is not advertised at first.
T38 starts with regular codecs in the SDP, and then later, a T38  
REINVITE is negotiated.

I guess the easiest way to handle that is:
-enable proxy media based on DID for inbound fax
-enable proxy media based on CLID for outbound fax

This requires to have specific extensions in your dialplan.

For outbound, you can also have a dedicated SIP profile for T38 ATAs  
so you can enable proxy-media for the whole profile.
For inbound, you may do the same if your ITSP/gateway can send you the  
fax DIDs on a specific trunk (so to a specific SIP profile).

Be aware that T38 is a PITA, and that you really need to validate that  
your T38 device is compatible with the other endpoint, which is  
probably a gateway.
If this gateway is yours, that's fine because you control it, and you  
can rely on it for your T38 service.
If it's not yours, you could have issues if some day, your iTSP  
decices to change it.

David Ponzone  Direction Technique
email: david.ponzone at ipeva.fr
tel:      01 74 03 18 97
gsm:   06 66 98 76 34

Service Client IPeva
tel:      0811 46 26 26
www.ipeva.fr  -   www.ipeva-studio.com

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Le 05/04/2010 à 00:00, Max Clark a écrit :

> How would one detect T38 and convert the session into proxy media?
>
> On Sun, Apr 4, 2010 at 11:35 AM, David Ponzone <david.ponzone at gmail.com 
> > wrote:
>> No, FreeSWITCH does NOT need to be in bypass media or proxy media.
>> You just need the regular passthrough module: mod_g729 and to allow  
>> G729 as
>> inbound and outbound codecs in vars.xml.
>> To summarize:
>> -normal mode (proxy disabled, bypass disabled): FreeSWITCH is in  
>> the RTP
>> path, it relays the audio stream between endpoints, but can still  
>> detect
>> DTMFs
>> -proxy media enabled: FreeSWITCH relays the audio stream  
>> transparently, DTMF
>> detection is impossible. In this mode, FS is really a "dumb"  
>> transparent
>> RTP-forwarder (this is required to get T38 working between the 2  
>> endpoints)
>> -bypass media enabled: FreeSWITCH is not in the RTP path
>> David Ponzone  Direction Technique
>> email: david.ponzone at ipeva.fr
>> tel:      01 74 03 18 97
>> gsm:   06 66 98 76 34
>> Service Client IPeva
>> tel:      0811 46 26 26
>> www.ipeva.fr  -   www.ipeva-studio.com
>> Ce message et toutes les pièces jointes sont confidentiels et  
>> établis à
>> l'intention exclusive de ses destinataires. Toute utilisation ou  
>> diffusion
>> non autorisée est interdite. Tout message électronique est  
>> susceptible
>> d'altération. IPeva décline toute responsabilité au titre de ce  
>> message s'il
>> a été altéré, déformé ou falsifié. Si vous n'êtes pas destinataire  
>> de ce
>> message, merci de le détruire immédiatement et d'avertir  
>> l'expéditeur.
>>
>>
>>
>> Le 04/04/2010 à 20:12, Max Clark a écrit :
>>
>> Clarification - for G729 does freeswitch need to be in "bypass media"
>> or "proxy media"? My understanding was that G729 would work with
>> "proxy media" enabled and without the new fangled module?
>>
>> -Max
>>
>> On Fri, Apr 2, 2010 at 2:23 AM, Jason White <jason at jasonjgw.net>  
>> wrote:
>>
>> Frank Church <vfclists at googlemail.com> wrote:
>>
>> I am just trialling Freeswitch with Linksys adapters, whose default
>>
>> codec I have set to G729 with 'Use Pref Codec Only:' set to no.
>>
>> When I change that setting to 'yes' the calls don't go through. I am
>>
>> using the latest Windows SVN.
>>
>> FreeSWITCH only supports G.729 in pass-through mode (i.e., with  
>> bypass media
>>
>> enabled). Apparently you can buy a G.729 licence for FreeSWITCH if  
>> you
>> really
>>
>> need it.
>>
>> My recommendation would be to use a codec other than G.729 unless  
>> you have a
>>
>> compelling reason, for example a carrier that only supports G.729.
>>
>>
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