Research and implementation between SIP and H.323 protocol in VoIP network

Before the SIP network appeared,the H.323 networks which transmitted by IP network system has been widely applied.Therefore,must take into the interworking between SIP networks and the H.323 network.Through analysis the problem such as address resolving and mapping,information mapping,the negotiation of media capability which are produced in the process of the two protocol interworking,and in-depth study of their state diagram,then,respectively launched a call model by SIP to H.323 terminals and H.323 to SIP terminals,simulating the interworking of two protocol,which proved this scheme is reasonable and practicable.