Legacy user proxy call session control function
View Patent ↗A Legacy User Proxy CSCF (“L-CSCF”) provides multimedia services from a SIP based network to legacy access networks and devices. The L-CSCF includes a legacy service control state machine; a P-CSCF state machine and associated protocols; a mapping between a user's legacy network address and a corresponding network entry point; a database and logic for mapping between legacy user addresses and corresponding authentication data; legacy specific QoS control mechanisms; and an interworking function to handle incompatibilities between the legacy and SIP call models. The L-CSCF may be disposed logically between the legacy network and the multimedia network to translate and process communications such that legacy network and multimedia network devices need not require extensive modifications in order to support operation.
1. A computer program product comprising a non-transitory computer readable medium having stored thereon program instructions which when run on a computer causes the computer to perform the steps of:
interfacing, with a call server control function, between a first network type and a second network type to provide a user of a first network type device with access to a service of the second network type, where the service is not available within the first network, including:
translating, with a first state machine, the service into first network type functionality using a corresponding second state machine operative to provide the service via second network type functionality;
providing a mapping between a user address of the first network type and a corresponding second network type entry point; and
providing a mapping between the user address and corresponding second network type authentication data.
2. The computer program product of claim 1 further including an interworking function in communication with the first and second state machines, said interworking function processing incompatibilities between a first network type call model and a second network type call model.
3. The computer program product of claim 1 further including controlling Quality of Service with a first network type Quality of Service control mechanism.
4. The computer program product of claim 1 including implementing the second network type using Session Initiation Protocol (“SIP”).
5. The computer program product of claim 1 including implementing the first network type using a Public Switched Telephone Network (“PSTN”).
6. A method for providing a service to a first network type device from a second network type device, where the service is not available within the first network, comprising the steps of:
receiving a signal initiated by the first network type device;
determining that the signal matches trigger criteria;
mapping between a user address of the first network type and a corresponding second network type entry point;
mapping between the user address and corresponding second network type authentication data;
translating the signal to a corresponding second network type message using a state machine operative to provide the service via second network type functionality;
transmitting the second network type message to the second network type device;
receiving a response from the second network type device;
translating the response to a corresponding first network type signal using a state machine operative to provide the service via first network type functionality; and
transmitting the first network type response to the first network type device.
7. The method of claim 6 wherein said translating steps include the further step of processing any incompatibilities between a first network type call model and a second network type call model.
8. The method of claim 6 further including the step of configuring Quality of Service for the first network type device.
9. The method of claim 6 wherein the second network type is Session Initiation Protocol (“SIP”) based.
10. The method of claim 6 wherein the first network type is Public Switched Telephone Network (“PSTN”) based.