Patent ID: 7440768

Claim:
In a half-duplex radio communication system coupled to a plurality of selective call radios (SCRs), a method comprising the steps of: receiving at the half-duplex radio communication system a monitor request message from a source SCR of the plurality of SCRs to determine a call availability status for each of a first list of at least one target SCR of a group member list of the source SCR; submitting from the half-duplex radio communication system a call availability status request to each of the first list of at least one target SCR; submitting from the half-duplex radio communication system to the source SCR a response state corresponding to the call availability status request of each of the first list of at least one target SCR; and updating the group member list according to the response state for each of the first list of at least one target SCR, wherein the method further comprises the alternative set of steps among a first set of establishing a half-duplex radio communication link between the source SCR and the first list of at least one target SCR responding in the affirmative and submitting a half-duplex message from the source SCR to the first list of at least one target SCR responding in the affirmative or a second set of selecting a second list of at least one target SCR from the updated group member list and establishing a half-duplex radio communication link between the source SCR and the second list of at least one target SCR.