FIELD: information technology.
SUBSTANCE: method involves receiving a call request, in a network, from calling user equipment (UE), where the call request carries a called UE identifier, and an early session supporting capability identifier and reliable responses capability identifier of the calling UE; and determining, in the network, that the called UE is a multimedia ring back tone (MRBT) service subscriber.
EFFECT: providing multimedia ring back tone service and multimedia caller identification service in a multimedia data transmission subsystem using an IP.
19 cl, 9 dwg
