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?

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

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