We have a setup with CUCM 10.5 and two Expressway pairs in two DC's. The Expressway-C and Expressway-E pair in DC1 is used as primary, the pair in DC2 as backup only. There are two SIP trunks from CUCM - one to Expressway-C in DC1 another one to Expressway-C in DC2. These two SIP trunks are grouped into a Route Group with the trunk to DC1 as the first choice. If we loose Expressway-C in DC1 than the SIP trunk goes down and all new calls are sent to DC2 pair. This is great! But if we loose Expressway-E in DC1 the SIP trunk to Expressway-C in DC1 is still up and as a result all calls are sent to nowhere. So the question is if there is any way to signal the CUCM that Expressway-E in DC1 is down and that all calls must be sent to DC2?