In a Cisco UCM multisite WAN with centralized call-processing deployment model, what redundancy feature should be configured on remote site routers to supply basic IP telephony services in the event of a WAN outage?
A. AAR
B. SRST
C. CAC
D. V3PN
What redundancy feature should be configured on remote site routers to supply basic IP telephony services in the event of a WAN outage?