The present invention provides a call/session control function for an Internet Protocol multimedia subsystem where a service template may be invoked in lieu of a single multimedia service. The service template identifies a number of multimedia services and associated logic for invoking the multimedia services, once the service template is invoked. In operation, a signaling message is received and appropriate filtering criteria are retrieved for the signaling message. Filtering criteria define a set of rules identifying any multimedia services that need to be invoked in light of receiving the signaling message. The filtering criteria will identify a service template, and perhaps other multimedia services to invoke directly. If a service template is invoked, the service template is obtained and the logic controlling invocation of the associated multimedia services is applied to effect invocation of the multimedia services.