IP - the VoIP PBX application technology, that is, with the help of the Internet, through the IP network using voice program, realize the importance of a voice application, network community in a few years ago the unified standard, called session initiation protocol (SIP), the new agreed represents the latest and most advanced VoIP technology, as a general purpose Internet protocol, it was almost all the major acknowledged PBX manufacturers, in the United States, many manufacturers have begun to provide VoIP business applications run SIP their network (such as vonage), although based on VoIP standards have been adopted, but SIP it is not limited to voice, but by far the most complete, the implementation of the most powerful video multimedia application technology,
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