The Abigail Braintree Foundation is a medium-size, not-for-profit literacy group that wants to implement centralized call processing. The group will implement a hub-and-spoke topology, with all of the remote branches connected to the central site via an IP WAN. The remote branch size will be limited to 150 IP Phones that are able to provide the SRST feature. Each time a remote branch Phone places a call, the control traffic traverses the IP WAN (even if the call is local to the branch) to reach the Cisco CallManager at the central site. All the control traffic is exchanged between a Cisco CallManager at the central site and endpoints or gateways at the remote branches. Which three signaling protocols can traverse the IP WAN in this deployment model? (Choose three.)
A.
SCCP
B.
H.450.1
C.
H.450.2
D.
SGCP
E.
H.323
F.
Telephony Application Programming Interface