Although I did cover why you can’t stretch a Front-end pool between two datacentres in: #Lync Question 4: Can I stretch a 2013 Front-End pool between two datacentres
So what about the other Lync pools?
Officially “Stretched pools are not supported for the Front End, Edge, Mediation, and Director server roles.” per Supported Lync Server 2013 Topologies
However they are support oddly for persistent chat server pools per Using a stretched Persistent Chat Server pool for disaster recovery
Supported Lync Server 2013 Topologies
Using a stretched Persistent Chat Server pool for disaster recovery