I see couple topics talking about MGCP preservation. Doesn't H323 have this? My understanding is in H323 when both CCMs go done, the call still stay. Why we have to mention this specificly in MGCP? Is this its limitation because of its slave-master native?
"The SRST/MGCP Fallback calls are H.323 calls, not MGCP calls, so if CallManager audits the endpoint, there's no active call for that MGCP endpoint. Call Preservation in its current state allows calls to be preserved when a CallManager fails and there is a backup CallManager available, but if a WAN link goes down and the gateway looses all communication with CallManager casuing it to go from MGCP to H.323 and vice versa, calls are lost"
That is true when you are talking about pots lines or T1 cas links. However, with PRI's and MGCP (H.323 is different) the Q.931 signaling is backhauled to CM. The MGCP endpoint (PRI in the gateway) does not process the Q.931 messages. So in this scenario when CM goes down all active calls will drop. There is a DDTS request to have the gateway take over the D channel and be able to generate MGCP endpoint data during any new calls such that failover and failback between CallManager and MGCP-fallback will preserve calls as well.
Correct. So bottom line is.... Currently with SRST/MGCP Fallback and PRI, active calls will be dropped when the WAN fails. Active calls will also be dropped when the WAN is back on line and CM is reachable. Correct? DDTS - CSCeb56616
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