VoIP-H.323

The Media Gateway (MGW) table holds information about each media gateway managed by the Call Agent. The media gateway can be uniquely addressed by domain name, an IP address, or the TSAP address.


Megaco/H.248 protocol: history


The Media Gateway table has two associated commands: RGW and TGW. The RGW command provisions a gateway as only a Residential GateWay, with the type token automatically set to RGW. The TGW command provisions a gateway as a Trunking GateWay only, with the type token automatically set to TGW. Both of these commands provision the Media Gateway table, but a service provider can use these commands to provide user security to certain individuals based on their roles.

H.323
------
H.225 also for RAS( Registration ,admission,Status)
H.225/Q.931 can be defined as signaling (eg.call setup)
H.245 can be defined as control signaling (eg .Terminal cabability setup )
H.320 can be defined as multimedia service over ISDN
H.321 or H.310 can be defined as multimedia service over B-ISDN
H.322 can be defined as multimedia service over QoS Garenteed networks
H.323 can be defined as multimedia service over packet networks
H.323 can be defined as multimedia service over SCN