[SR-Users] Kamailio+ Asterisk 491 error code ????

Hello, I've just setup Kamailio+ Asterisk following Daniel Constantin Mierla howto http://kb.asipto.com/asterisk:realtime:kamailio-3.1.x-asterisk-1.6.2-astdb Everything seemts to works and I'm able to place a call to local extensions. I'm able to establish a call but strangely I get and 491 error code on my SIP Phones In my Asterisk console I get this error : [Jun 28 18:14:42] WARNING[24432]: chan_sip.c:18087 handle_response_invite: just did sched_add waitid(23) for sip_reinvite_retry for dialog LIFuQLu1l3ZtKrNy0XDX7lEk.Y5JdFko in handle_response_invite == Spawn extension (from-local, 102, 1) exited non-zero on 'SIP/103-00000000' Anybody can give me an hand to solve this issue ? Best regards