Which Call Admission Control mechanism is supported for the Cisco Extension Mobility Cross Cluster
solution?

A.
Location CAC

B.
RSVP CAC

C.
H.323 gatekeeper

D.
intercluster Enhanced Location CAC

E.
visiting cluster’s LBM hub

Explanation:
Configuring extension mobility cross cluster (EMCC) is nothing you should take lightly. EMCC requires
a lot of configuration parameters including the exporting and importing of each neighbor cluster’s
X.509v3 digital certificates. EMCC is supported over SIP trunks only. Presence is another feature
that’s only supported over SIP trunks. If you want to be able to perform scalable Call Admission
Control (CAC) in a distributed multi-cluster call processing model, you will need to point an H.225 or
Gatekeeper controlled trunk to an H.323 Gatekeeper for CAC… but if you want to support presence
and EMCC between clusters and maintain CAC.