Which of the following gateway protocols have all their dial plan information configured in CCM?

A.
MGCP only

B.
SIP and H.323

C.
SIP and Skinny

D.
MGCP and Skinny

Explanation:
Cisco CallManager System Guide, Release 3.1(2)
Understanding Voice Gateways
Gateways, Dial Plans, and Route Groups
Use dial plans to access or call out to the PSTN, route groups, and group-specific gateways. Ensure remote Cisco CallManagers across the IP WAN are configured as intercluster (H.323) gateways.
The different gateways used within the Cisco IP Telephony Solutions have dial plans configured in different places:
Configure dial-plan information for both Skinny and MGCP gateways in the Cisco CallManager.
Typically configure H.323-based Cisco IOS Software gateways dial plan Configuration in Cisco CallManager to access that gateway and configure dial peers in the gateway to pass that call out the gateway.
The route group points to one or more gateways and can select the gateways for call routing based on preference. The route group can direct all calls to the primary device and then use the secondary devices when the primary is unavailable. This serves effectively as a trunk group. One or more route lists can point to the same route group. All devices in a given route group share the same characteristics such as path and digit manipulation. Route groups can perform digit manipulation that will override what was performed in the route pattern.
Configuration information associated with the gateway defines how the call is actually placed.
You can configure an H.323 gateway to be gatekeeper-controlled. This means that before a call is placed to an H.323 device, it must successfully query the gatekeeper. Multiple clusters for inbound and outbound calls can share H.323 gateways, but MGCP and SGCP-based gateways are dedicated to a single Cisco CallManager cluster. http://www.cisco.com/en/US/partner/products/sw/voicesw/ps556/products_administration_guide_chapter09186 a