Hi all, I've seen in the debug output that when a UAC setup a call to PSTN Gateway, the reply 100 Trying generated from my GW is handled from my SER with this ERROR code in the debug: ERROR: on_reply processing failed ->>>>>>>>> T_code=100, new_code=100 It's 'normal' ERROR or I've to setup a on_reply block also for this provisional response (100 Trying) or is a my ser.cfg error or, more, is a abnormal behaviour of the tm module?? After receipt of the 183 Session Progress the call going on without problem. Thanx in advance for the reply. Verbal