How do VOIP phones stay registered with CCM

How do VOIP phone register with CCM.

Our network uses point to point RF links, and sometimes the RF takes short
interference 30 sec to 1 min. This causes the VOIP phone to re-register with
the call manager, and non-technical people think the network is down because
the phone are re-registering. How does the VOIP phone know the signal has
dropped? Does the phone use a type of hello or keepalive? can this value be
adjusted in the Call manager. I tried simple google searches but i could not
find the protocol or method the phone use to stay registered with the CCM.

Thank you
Rob

Blogs and organic groups at http://www.ccie.net
Received on Thu May 05 2011 - 20:00:00 ART