Which two statements are true regarding SCCP? (Choose two.)
A.
SCCP requires each endpoint or gateway event to be communicated to Cisco Unified Communications Manager.
B.
Endpoints can operate autonomously if communication with Cisco Unified Communications Manager is lost.
C.
SCCP may interoperate with H.323 endpoints if it is implemented with Cisco Unified Communications Manager.
D.
Endpoints and gateways maintain the dial plan.
E.
SCCP uses hex messages for communication.
Explanation:
The Skinny client (i.e. an Ethernet Phone) uses TCP/IP to transmit and receive calls. Skinny messages are carried above TCP and use port 2000. Cisco IP Phones that use SCCP can coexist in an H.323 environment. When used with CUCM, the SCCP client can interoperate with H.323-compliant terminals. The client communicates with the CUCM using TCP/IP-based communication to establish a call with another H.323-compliant end station. Once the CUCM has established the call, the two H.323 end stations use connectionless UDP/IP-based communication for audio transmissions. The CUCM acts as a proxy by processing all H.323 and SIP transactions. This allows the IP Phone to process the VoIP RTP data stream.
http://www.cisco.com/en/US/docs/voice_ip_comm/cata/186_188/2_15_ms/english/administration/g uide/sccp/sccpaaph.pdf