H323 Call Preservation

H323 gateway is a non-survivable endpoint. This means an active call will drop if any call manager goes down. This default behavior of an H323 gateway can be changed by playing with few settings at the CUCM and gateway. At gateway: voice service voip h323 call preserve At CUCM: Allow TCP Keepalive for H323¬† = False Allow Peer to Preserve Call¬† = True Restart CCM service of PUB Verification: Make an inbound call from PSTN to the phone. During the call, stop the CCM service at Sub but your call will not drop! This is what you will see at … Continue reading H323 Call Preservation