Patent ID: 7912070

Claim:
A communication system, comprising: a network; a first network device coupled to said network, wherein said first network device is adapted to set up a half duplex communication session between first and second subscriber units (SUs); a voice over Internet Protocol (VoIP) server coupled to said network, wherein said VoIP server is adapted to: receive a VoIP request to switch said half duplex communication session to a full duplex communication session from said first subscriber unit (SU) by way of said network, while said half duplex communication session is active; forward said request to said second subscriber unit (SU) by way of said network; receive an acceptance of said request from said second subscriber unit (SU) by way of said network, or receive a denial of said request from said second subscriber unit (SU) by way of said network or receive no acceptance of said request within a predetermined time period; set up said full duplex communication session between said first and second subscriber units (SUs) when said acceptance is received; and send a first notification denying said request to said first subscriber unit (SU) when said denial is received from said second subscriber unit (SU) or no acceptance of said request is received within said predetermined time period.