Hello, I'm helping a colleague (*) which has the following setup:
ITSP --- <T.38 capable PJSIP trunk> --- Asterisk 13 --- <PJSIP>-- Audiocodes MP-112 --- <FXO/FXS> --- Fax machine My issue is the following : Audiocodes gateway reject INVITEs with 488 Not Acceptable Here It seems this gateway requires t38 settings to be present in SDP body in the very first INVITE. My questions are the following: 1. I expected T.38 to exclusively work with reINVITE where calls are established as normal voice calls (PCMA/PCMU in SDP, for instance) and then upgraded to T.38 (when CNG is detected, for instance). Have you ever heard of T.38 sessions being established right from the start (ie with T.38 settings in the first INVITE) ? 2. Is it possible to configure Asterisk to pass T.38 settings in SDP in the first INVITE it sends ? 3. Any suggestion with Audiocodes gateway ? Regards (*) That's the reason why I don't have as many details as I would like, at the moment.
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