These has being mentioned many times over and is documented on issue id CSCuq79072. I also experienced it first handed few years back.
According to Cisco MRA Deployment Guide , Cisco does not support failover for any service except IM&P on jabber. Recently i have being testing with jabber (22.214.171.1249866) and latest CUCM (11.5(1)Su5) and Expressway (8.11.2) and i was surprise to find out that jabber is able to failover to secondary CUCM when primary was turned down. Cisco said is not "supported" because is "inconsistent" o even not possible because of how client use TCP to connect and detect failure
The interesting piece is that jabber shows being register in one CUCM and CUCM GUI reports another but calls can be routed successfully.
Does somebody else has similar experience?
I'm using amlso CUCM 11.5(1)SU5 but with EW 8.11.4 and client CUCILync 11.6.5 and didn't manage to register to secondary Subscriber when primary stop.
You say that it's working for you, can you explain how di you manage it ? Have you only one EW-E or a pair ?
All details could be usefull for me
Thank for your answer.
I've been informed by Cisco that this feature will be supported with Expressway version 12 announced for end of April 2019.
Does anyone know if this functionality has been released yet?
12.5 has been released but I do not see anything in the release notes about this new feature.