Patent ID: 8462768

Claim:
A method comprising: receiving, by one or more devices of a Session Initiation Protocol (SIP) network and from a SIP proxy server, a modified SIP INVITE request associated with an outbound call, the outbound call being from a Public Switched Telephone Network (PSTN)-based user device that is associated with a calling party; extracting, by the one or more devices of the SIP network, data associated with a SIP-based user device from the modified SIP INVITE request, the data including a Simple Object Access Protocol (SOAP)-remote procedure call (RPC) Uniform Resource Identifier (URI); generating, by the one or more devices of the SIP network, a RPC invocation based on the SOAP-RPC URI; providing, by the one or more devices of the SIP network and to a PSTN-based call controller, the RPC invocation and the modified SIP INVITE request by using a RPC interface of the one or more devices of the SIP network; and enabling, by the one or more devices of the SIP network and for the outbound call, communication, via the RPC interface, with the SIP-based user device.