After rebooting my asterisk server (1.2B2) I could still call my Sipura SIP phones from outside (via cell phone). But I have a customer with two Cisco SIP phones...I don't know the exact model...those two phones could not be reached. The message in the console: Nov 8 10:03:34 NOTICE[4207]: app_dial.c:1110 dial_exec_full: Unable to create channel of type 'SIP' (cause 3 - No route to destination) Why would the Sipura SPA2002's keep working after a reboot but not the Cisco phones? On a somewhat related note: Is there a file where asterisk stores current SIP registrations or does it just store them in memory? Or perhaps is there a way to export current registered SIP users before a reboot, do the reboot, then import them back in? The idea is to make it transparent to the user.