Which of the following describes what function Multicast allows the H.323 Terminal to perform?

Orla P.Apr 13, 2026

The correct answer is D. Multicast in H.323 lets a Terminal identify multiple other H.323 Terminals as the intended recipients of a single outgoing video stream, so one transmission goes out and each addressed Terminal picks it up rather than the sender establishing separate unicast connections to each one. This is fundamentally an addressing and delivery function, not a call-setup or collaboration function, which is why the other choices miss the mark. Option A trips people up because Multipoint calls actually require a Multipoint Control Unit, and the MCU is doing the heavy lifting there, not the Multicast capability of the Terminal itself. Option C is T.120 territory for data collaboration, and option B is describing something else entirely, so once you separate the addressing role of Multicast from those other mechanisms, D becomes the clear pick.

Fatima Z.Mar 22, 2026

A sounds right but multicast tags broadcast targets, so go D.

Bao N.Mar 19, 2026

Ran this one last night and I picked A without thinking twice, figured Multicast was just about enabling multipoint calling since that is the first thing that comes to mind when you hear it in an H.323 context. But then I went back and actually sat with what Multicast specifically does at the protocol level, and it clicked that the question is asking about the function Multicast allows, not what H.323 multipoint conferencing does in general. Multicast in H.323 is about addressing, meaning you are identifying a group of terminals as recipients of a single outbound stream, which is exactly D. A would be more accurately tied to the MCU or the terminal's general multipoint capability, not Multicast as a discrete function.

Carlos M.Apr 5, 2026

D is right. The Multicast function in H.323 lets a Terminal address a single stream to multiple endpoints simultaneously, so instead of the Terminal sending separate unicast streams to each recipient, it sends one stream that the network delivers to all identified H.323 Terminals in the multicast group.

Ola B.Apr 21, 2026

Multicast lets one Terminal fan out its stream to multiple simultaneous video sessions, that's B.