I have many ATA devices, some ATA186, some SPA2000 and some Handytone, and I'm verifing an strage behavion on the *, many times a day they have problems with registration and show the messages below: Oct 28 11:04:02 NOTICE[1087720240]: chan_sip.c:7493 handle_request: Registration from '2007 <sip:2007@192.168.199.4>' failed for '192.168.199.254' Oct 28 11:08:34 NOTICE[1087720240]: chan_sip.c:7493 handle_request: Registration from '30815936 <sip:30815936@192.168.199.4>' failed for '192.168.199.254' Oct 28 11:32:42 NOTICE[1087720240]: chan_sip.c:7493 handle_request: Registration from '<sip:862182600@xxx.xxx.xxx.xxx;user=phone>' failed for 'xxx.xxx.xxx.xxx' The first two are internal users and the other is a external user, but the same problem for all. At the same time tethereal show me this: 111.590755 192.168.199.254 -> 192.168.199.4 SIP Request: REGISTER sip:192.168.199.4 111.591691 192.168.199.4 -> 192.168.199.254 SIP Status: 100 Trying (1 bindings) 111.591737 192.168.199.4 -> 192.168.199.254 SIP Status: 401 Unauthorized (1 bindings) 112.035409 192.168.199.254 -> 192.168.199.4 SIP Request: REGISTER sip:192.168.199.4 112.035918 192.168.199.4 -> 192.168.199.254 SIP Status: 100 Trying (1 bindings) 112.036004 192.168.199.4 -> 192.168.199.254 SIP Status: 403 Forbidden (1 bindings) 120.440002 192.168.199.4 -> 192.168.199.254 SIP Request: OPTIONS sip:192.168.199.254 120.543970 192.168.199.254 -> 192.168.199.4 SIP Status: 404 Not Found 120.579986 192.168.199.4 -> 192.168.199.254 SIP Request: OPTIONS sip:192.168.199.254:5061 120.639660 192.168.199.254 -> 192.168.199.4 SIP Status: 200 OK 135.900559 192.168.199.254 -> 192.168.199.4 SIP Request: REGISTER sip:192.168.199.4 135.901490 192.168.199.4 -> 192.168.199.254 SIP Status: 100 Trying (1 bindings) 135.901536 192.168.199.4 -> 192.168.199.254 SIP Status: 401 Unauthorized (1 bindings) 136.183625 192.168.199.254 -> 192.168.199.4 SIP Request: REGISTER sip:192.168.199.4 136.184145 192.168.199.4 -> 192.168.199.254 SIP Status: 100 Trying (1 bindings) 136.186100 192.168.199.4 -> 192.168.199.254 SIP Status: 200 OK (1 bindings) 140.240036 192.168.199.4 -> 192.168.199.254 SIP Request: NOTIFY sip:2007@192.168.199.254:5060 140.423624 192.168.199.254 -> 192.168.199.4 SIP Status: 200 OK 180.560010 192.168.199.4 -> 192.168.199.254 SIP Request: OPTIONS sip:192.168.199.254 180.777467 192.168.199.254 -> 192.168.199.4 SIP Status: 404 Not Found Some times the device register and some times it realy fail. Thank's a lot in advice for any help. Kind regards, Miguel