The Design And Realization Of Distributed Gateway On The Basis Of H.323 Protocol

The VoIP, the applied technique which gathers Internet with telecommunication networks becomes the hot issue, yet IP￡"Internet Protocol￡?telephone is even the current hot topic in the communications field. The expected target of the overall design about the IP telephone technology which uses advanced network technique and managing means and coding—decoding technique and the lower expenses cost than the traditional PSTN is providing customers with the preferable telephone service in quantity. If we will achieve VoIP, then we must achieve gateway.At the foundation of Gateway technique principle and H.323 protocol, this thesis designs and realizes" The design and realization of distributed gateway architecture on the basis of H.323 protocol".At first,this thesis introduces the Gateway basic conception, world and china gateway develepment and its problem, this thesis leading task—This thesis includes keyword technique of design distributed gateway, design H.323 distributed gateway, call procedure of distributed gateway,procedure realization of distributed gateway , analyse H.323 call procedure and put forward to reformation project,put forward to fast connection procedure, analyse gateway problem and reformation it which includes the H.225.0 call signalling channel shall remain open during the call, closing the call signalling channel will terminate the call , the time to live functionality was enhanced to allow the GK to send a longer time to live time, add ARQ message , BRQ message, teminalcapacityset message , masterslavedeterminationmessage and so on.Next, we introduce the key problem- voice processing technique and H.323 protocol.Next, according to Chinese signal complex, designs and realizes distributed gateway architecture on the basis of H.323 protocol.In the end, according to my task,this thesis bring forward " Arion3002 design , realization and test".