Thanks for your reply. I sniffed it before and I am pretty sure it doesn't. It always has '1 Regstier' in the cseq field. I have a grandstream phone that works just fine and so does my x-lite phone. Natambu Obleton Network Engineer FastTrack Communications nobleton(a)fasttrackcomm.net (970) 247-3366 office (970) 247-2426 fax -----Original Message----- From: Bogdan-Andrei Iancu [mailto:bogdan@voice-system.ro] Sent: Tuesday, October 17, 2006 10:53 AM To: Natambu Obleton Cc: users(a)openser.org Subject: Re: [Users] "invalid cseq for aor" Hi Natambu, the log is printed when a phone re-REGISTER using the same cseq and callid number as in the previous REGISTER. Can you do a network trace and check the cseq and callid for the initial REGISTER and the next re-REGISTER? regards, bogdan Natambu Obleton wrote: