Mark works as a Voice technologies associate for PassGuide Inc. His company uses Cisco IP phones for its voice network. He wants to use a protocol that can be used for communication between Cisco UCM and terminal points. He also wants the protocol to provide a facility to make quick changes to it and add needed features and functionality. Which of the following protocols will he use for the network?

A.
H.323

B.
SCCP

C.
SIP

D.
MGCP