To bridge H.323 calls to H.324, which is audio and video transmission over standard telephone lines. In this case, gateway functions are similar to an MCU for connecting people over networks. On the other hand, an MCU typically connects many H.323 devices in a multipoint conference. Gatekeeper device Gatekeepers provide network services to H.323 terminals, MCUs, and gateways. H.323 devices register with gatekeepers to send and receive H.323 calls.
Gatekeepers give permission to make or accept a call based on a variety of factors.
Helping to route a call to the correct destination. Determining and maintaining the network address for incoming calls. With H.225.0, multiple audio and video streams transport inbound and outbound NetMeeting information. With H.323 protocols, NetMeeting users can communicate with and transmit data to other compatible audio or video clients. In addition, an MCU allows multiuser audio and video conferences between multiple NetMeeting clients, as well as other H.323-compatible products.