I have a situation when sometimes an inbound call attempt is dropped before the connection is established. For example ... if I called a number on my company from a mobile or public phone .. the company phone rings once and dies before I get the chance to answer it.
We have call manager 4.1 and using 2821 configured as MGCP gateways (Primary and backup) using PRI. Both gateways show registration with Call manager ok when using show ccm. Unfortunately I have not been able to reproduce the issue and at the same time debug isdn q931. Any advice or links that could help me pinpointing this issue is much appreciated.