Patent ID: 7082315

Claim:
A mobile station comprising: a processor, a memory coupled to the processor and storing therein an instruction set, a transmitter and a receiver both coupled to the processor and being adapted to operate in accordance with a communications protocol using Group Call Access Permission (GCAP) and Help Request Level (HRL) fields stored in the memory, a user interface including a display coupled to the processor and responsive to the instruction set stored in the memory for selecting, setting and displaying the GCAP and HRL fields, a GCAP extractor and an HRL extractor for extracting values of GCAP and HRL fields of an incoming message, and respective comparators coupled to the GCAP extractor and to the HRL extractor for comparing the values of the respective fields extracted thereby with values stored in the memory; said processor being responsive to respective outputs of the comparators for determining whether to join an incoming call.