A method and system for selecting a Multimedia Resource Function Controller (MRFC) for allocating resources for a conference call based on a pre-defined condition. In a first embodiment, the condition is associated with a status of an MRFC of a first network, such as an overload of resources, a failure, or an inexistence of the MRFC in the first network. When the condition is detected, an application server (AS) of the first network delegates the responsibility of allocating the resources for the conference call to an MRFC of a second network. In a second embodiment, the pre-defined condition is associated with a location of a User Equipment (UE) involved in the conference call. Based on the UE's location, the AS of the first network selects an MRFC of a second network, and delegates the responsibility of allocating the resources for the conference call to the MRFC of the second network.