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-le...@lists.kamailio.org > Important: keep the mailing list in the recipients, do not reply only to > the sender! >
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