2009/3/13 michel freiha michofr@gmail.com:
I would like to know please what could be added in the onreply_route[7] in order to accept T38 negotiation and let the FAX go through
As others have already explained, Kamailio has *nothing* to do with T38 negociation. You have a problem in your configuration when dealing with in-dialog requests, just it.