External trusted party call processing in SIP environments

A method for performing Internet call processing functions in a third-party call processing entity forwarded by a session initiation protocol (SIP)-compliant proxy, comprising the steps of:

• detecting a transfer of call processing control to said third-party call processing entity;
• executing requested call processing functions;
• and
• returning an external-result to said SIP-compliant proxy for completion of call processing.

A computer readable medium storing computer executable instructions that, when executed by a session initiation protocol (SIP)-compliant proxy server, perform a method for outsourcing Internet call processing functions, comprising:

• executing a call processing language script in said SIP-compliant proxy;
• detecting an external-switch;
• transferring call processing to a third-party call processing entity identified in an external-switch parameter;
• receiving an external-result;
• and
• completing said call processing based on said external-result.

A session initiation protocol (SIP)-compliant proxy, comprising:

• memory storing computer executable instructions that, when executed by the proxy, perform steps of:
• executing a script in said SIP-compliant proxy;
• upon detection of an external-switch, transferring call processing to a third-party call processing entity identified in an external-switch parameter;
• receiving an external-result;
• and
• completing said call processing based on said external-result.