All: Starting switching over my phone lines. I got phone line 1 switched. Everyone working. I switched the second phone line, and it worked about an hour, then I started getting errors from the cli saying the server could not register with the providing. I restarted the system, and it worked ok for about 30 minutes, and then started giving he same errors. The error is [Jul 13 11:21:14] NOTICE[27331]: chan_sip.c:10169 sip_reg_timeout: -- Registration for '4342201092 at ia.ntelos.net' timed out, trying again (Attempt #19) > doing dnsmgr_lookup for 'ia.ntelos.net' It keeps doing this until I restart asterisk. No, the password hasn't changed - the system works fine for anywhere from 5 minutes to 30 minutes, but again, I suspect it depends on the call load. I suspect it has something to do with the call load, but there really wasn't that many calls in progress - maybe 5 at the time of the failure. I have since switched the last phone back to the old system (it handles the volume of our client calls). Anyone else experience this? Where should I start looking - at my server, or at the provider? Thanks, Eddie