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Discussion of Group Scope Some of the specific objectives of the task group are: Define a reference architecture describing common network elements for SP to IP PBX peering. Specify the basic protocols (and protocol extensions) that must be supported by each element of the reference architecture. Specify the exact RFCs or other existing standards associated with these protocols that must or should be supported by each element of the reference architecture. Specify consensus methods of formulating protocol messages where multiple options exist. Define a practical method of authentication that provides adequate user security and billing traceability to a single identity. This method must preserve the optional identification of users and endpoints ‘behind’ an IPX. Scope of minimum/default recommended features: Codec support, packetization intervals, echo, and other media capabilities. Fax and modem transmissions. DTMF tones. Message Waiting Indication information. Conveying traffic priority to the SP to support QoS enforcement. Universal set of basic features in an IP PBX to service provider interface. Basic guidelines for interfacing with an IP PBX when NAT or firewalls are on path. Basic security model based on existing standards to authenticate and authorize utilization of the service provider’s resources by an IP PBX. Also, ensure confidentiality and authenticity between the service provider and IP PBX. |