Which solution is needed to enable presence and extension mobility to branch office phones during a WAN failure?

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Which solution is needed to enable presence and extension mobility to branch office phones during a WAN failure?
A . SRST with MGCP fallback
B . SRST without MGCP fallback
C . Cisco Unified Communications Manager Express in SRST mode
D . SRST with VoIP dial peers to Cisco Unified Communications Manager Express

Answer: C