[SIPForum-discussion] Decline T.38 Fax calls before routing

Murali Natesh murali87ece at gmail.com
Sun Mar 8 08:12:59 UTC 2015

Hello Rakesh,

Yes you can enable G.711 fallback for T.38. So the B party or not supported
party will send 488not acceptable. Then another offer will send to make fax
cal by G.711.Sip profile needs to be configured like this.

On 7 Mar 2015 23:45, "Rakesh Baluja" <rakeshbaluja at hotmail.com> wrote:

>         Hello,
> Can we decline just T.38 fax calls on soft switch or SBC before routing
> with 503?
> Example:  Customer A is sending fax calls on G729 & G711 and is being
> terminated by Vendor B & Vendor C. Vendor B supports T.38 fax calls but
> Vendor C does not support T.38 fax calls but supports only G711 fax calls.
> 1. Can a soft switch like MVTS Pro or any other SBC decline fax calls with
> T.38 codec before routing to Vendor C for Customer A to re-route.
> 2. Can we convert codec from T.38 to G711 fax calls on the soft switch?
> Thanks in advance.
> Rakesh Baluja
> 416-670-3366
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