You clientisexperiencing trouble with the CiscoTelePresence system. User can successfully make video calls between H.323 devices, but when they call a SIP-based device, the call connects with only the audiofunctiong, what is a possible reason for this problem? Select exactly 1 answer(s) from the following:

A.
SIP and H.323 devices must be connected directly using IP addresses to prevent video corruption

B.
SIP and H.323 use different video protocols and cannot exchange video

C.
SIP to H.323 calls need to be routed through an H.323 gataway to support video

D.
The SIP-based device may not share a common video protocol with the H.323 devices