On Apr 26, 2018, at 5:20 PM, Dominique Jeannerod <dominique.jeannerod@interact-iv.com> wrote:

Hello,

I currently use Freeswitch 1.6.8-1 in production, and have some ISDN gateways sending SDP including T.38 for voice calls (not faxes). Calls are handled without problems by freeswitch.

I have another platform, with freeswitch 1.6.19 and same configuration.

However, voice calls received with SDP including t.38 are rejected with 488 INCOMPATIBLE_DESTINATION :

ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] switch_core_media.c:4028 sofia/internal_1/33183817938@gv-ics-prd-301 T38 REFUSE on request

ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [NOTICE] sofia.c:7566 Hangup sofia/internal_1/33183817938@gv-ics-prd-301 [CS_NEW] [INCOMPATIBLE_DESTINATION]

I didn't find any valid configuration to make those calls accepted, except configuring proxy_media, which I don't want to use.

Is this behaviour a "normal" behaviour ? Could it be a bug ?

This is a very big issue for us ...