[cisco-voip] Expressway HA Failover when ISP fails

[Nick]

Hi All

We have a situation with a client where they have an Expressway cluster 2 x
ExpC and 2 x ExpE split across two datacentre, each datacentre has
different ISP's. If they have a internet outage at one of the datacentres,
50% of the outbound video traffic is lost.
The CUCM has one SIP trunk with the 2 ExpC IP's so is the Expressway not
able to determine an ISP outage and if not how are 50% of the calls getting
through, does the Expressway load balance between each node in the cluster
and if so is there any way to change this to cater for an ISP outage?
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