How does the Cisco IP Phone in a branch office know which device will be running SRST when there is a WAN outage?

A.
Cisco IP Phones need to have the devices IP address in the Cisco CallManager list.

B.
Cisco IP Phones are notified by the device when there is an IP WAN outage which IP address to use.

C.
Cisco IP Phones randomly select a router to fail to, so all routers at the branch site must be running SRST.

D.
Cisco IP Phones use the default gateway IP address in their configuration as the last resort for call processing in an IP WAN outage.

Explanation:

Answer A is more appropriate, as the SRST IP address information is registered in the Cisco IP Phone’s Call Manager list.