Systems and methods for IMS user sessions with dynamic service selection

A system for generating dynamic call models within an IP Multimedia Subsystem (IMS) network so that different user entities (UEs) can have different IMS service experiences, the IMS network including application servers (ASs) for providing services to the UEs based on service requests by the UEs, the IMS network further including a serving call state control function (S-CSCF) for receiving service requests by the UEs and forwarding the requests, the system comprising:

• storage media storing a service tree, the service tree defining a plurality of potential call models, the potential call models mapping potential service requests by the UEs onto the ASs, at least two of the potential call models mapping a specified potential service request by a UE onto different ASs capable of providing different service experiences to the UE;
• and
• control logic for providing session control for the UEs,
• the control logic receiving service requests by the UEs forwarded by the S-CSCF and receiving the service tree from the storage media;
• the control logic generating a call model for each UE based on the potential call models defined by the service tree and on the service requested by that UE;
• and
• the control logic invoking a specified AS based on the call model generated for that UE.