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There is not currently a well-defined, standard operational approach for interfacing an IP PBX with a VoIP-based service provider using SIP. SIP Implementations vary greatly among different service providers and IP IPBXs SIP is currently defined in ~28 RFCs and ~ 170 IETF Drafts SIP is also very flexible. Not every vendor implements consistently. Only basic interoperability is commonly possible ‘basic trunking’ or ‘proxy to proxy’ routing ‘single user account’ that works with a single user ITSP service. Both models have considerable drawbacks IP PBX to SP: Current State of Interoperability |