CCM3.3(3) with 2* MGCP Gateways integrated with a PBX via 4 *PRI T1.
The MGCP GW1 has PRI1 and PRI3 to the PBX, and the MGCP GW2 has PRI2 and PRI4 to the PBX. Based on the route plan on the PBX, the PBX will always try to route incoming calls to the highest priority T1:PRI4 first, then PRI3, PRI2 and PRI1.
If the MGCP GW2 lost connection to the CallManager, dose the MGCP GW2 automatically set the PRI D-channel down to prevent the PBX from routing incoming calls to PRI 4/ PRI 2, and PBX will route incoming calls to other active T1:PRI1 /PRI3?
If not, all incoming calls will be lost as the PBX routes all calls to PRI 4 first.
Does Cisco MGCP Gateway support the features? And How to handle this situation.
If the gateway is not able to register with the Call Manager it will not 'shut down' the D-channel. The MGCP IOS gateway handles up to Layer 2 signaling on it own. What will happen is that no call setup will happen since the Q.931 messages are backhauled to the CCM. Since those messges will not be answered, call setup will not happen on the gateway.
Now your PBX should handle this and move on to the next PRI in the trunk group (since there was no call setup).
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