What component acts as a user agent for both ends of a …

seenagape

8 years ago

What component acts as a user agent for both ends of a SIP call while Cisco Unified SIP SRST is providing failover during a WAN outage?

A.
B2BUA

B.
SIP server

C.
SIP proxy

D.
SIP SRST router

E.
SIP registrar