Honestly, for faxing and t38, you should use g711 a/uLaw only or a high bit rate/high quality codec! Fax is a 9.6kbps (or 14.4kbps) codec and g729a is 8kbps, a low bit rate codec. How do you expect to have it working using g729a which will compress fax data even more?
Check this article https://www.voip-info.org/asterisk-fax/ ... it is 20 years old, already, but still very accurate.
Atenciosamente / Kind Regards / Cordialement / Un saludo,
*Sérgio Charrua*
On Fri, Feb 14, 2025 at 6:48 PM Temilolu Fayomi via sr-users < sr-users@lists.kamailio.org> wrote:
Hello,
I am working with inbound calls on kamailio (specifically fax), and was wondering if there was a way to re-prioritize the codecs found in the sdp of an invite. I've looked at using the sdpops module, but haven't been able to re-arrange the priority of the codecs listed. I've tried removing codecs to help incoming faxes switch over to t38 per my upstream providers instructions (calls will do a t38 re-invite if the g729a is the highest priority). I am just looking for which direction to go from here or if I misunderstand the nature of faxing and kamailio.
Thank you in advance, Temilolu Fayomi __________________________________________________________ Kamailio - Users Mailing List - Non Commercial Discussions -- sr-users@lists.kamailio.org To unsubscribe send an email to sr-users-leave@lists.kamailio.org Important: keep the mailing list in the recipients, do not reply only to the sender!