You are configuring a network to support voice to the PSTN. One important aspect to the
configuration is to be able to determine the individual slot, subunit, and port number from the
gateway endpoint identifier. Which signaling protocol is appropriate for this situation?

A.
H.323

B.
SIP

C.
SCCP

D.
MGCP

Explanation:
Endpoints are any of the voice ports on the designated gateway. These voice ports
provide connectivity to both analog ports and digital trunks to the PSTN. Ports on gateways are
identified by endpoints in very specific ways. It is important to note that gateways can have
multiple endpoints dependent on the number of ports it contains, and that the endpoints are case
insensitive. A sample MGCP endpoint addressing scheme is provided below.

http://www.cisco.com/en/US/tech/tk1077/technologies_tech_note09186a00801da84e.shtml