At present in the domestic open the phone to the VoIP network mainly adopts h. 323 agreement; Proposed by IETF session initial protocol, mainly to solve the problem of multimedia conference of Internet TV service, is used to establish sessions between hosts on the Internet, the first is based on HTTP protocol, designed to follow the basic principles of the Internet, the protocol is easy to be extended, to increase new business, with strong interoperability, SIP protocol is decentralized, the complexity of the network equipment to the edge, need relatively intelligent terminal, this paper first introduces the characteristics and current situation of the development of VoIP technology, analyzes the influence on VoIP technology, P2P technology and the security technology, VoIP session edge controller technology, finally, discusses the VoIP business and some problems need to be solved,
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