The last VOIP workshop I'd been to in Chicago used a bunch of modules exhibited in the
efficient LCD projector. It was from
Vovida Organization. In fact, you can find this online, but for those who wish to get an on-the-spot overview of the module, read on. The Vovida Org has done its best to produce a simplified explanation of VOIP, SIP, Megaco, and MGCP to the general public who are looking for resources on the VoIP.
So what has Vovida got to offer to us? The module talks about SIP as well as H.323. MGCP. SIP is Session Initiation Protocol that deals primarily with a set of protocols (operating procedures) between users. MGCP (Media Gateway Control Protocol), on the other hand, controls telephony for external call agents. Under the SIP topic, Vovida delineates the SIP Framework, Distributed Architecture, User Agents, Proxy Server, Location Server, Redirect Server, Registrar Server, SIP Messages, Methods and Responses, SIP Headers, and SIP Addressing.
It also discusses more advanced topics such as IETF Protocols and H.323. The module particularly delves on integration with the IETF Protocols, the scalability, simplicity, mobility, and feature creation. H.323 topics include framework, components, terminals, gateway, gatekeepers, umbrella specification, signaling, Multipoint Control Unit. Vovida provides a table of comparisons to easily understand SIP, MGCP, and H.323. Those who wish to learn more about MGCP can find information about components, call flow, MGCP commands, characteristics, and example comparisons.
