What should I do if SIP Registration keeps dropping?

If you are using a PBX (Elastix, FreePBX, 3CX..etc) please add qualify=yes to both the Peer & User Details.  You may also want to change the domain name to the IP Address (ex. sip.ipcomms.net ->64.154.41.177).  Login to your account or open your Provisioning Letter to view your domain.