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.