A method enabling a system to transfer one or more telephony functions associated with a wireless handheld telephony device (11, 111) to a second telephony device (17, 101), for redirecting voice communication directed to the wireless handheld telephony device (11, 111) to the second telephony device (17, 101), the system comprising a data processor, media readable by the data processor, a call server and optionally an intermediary, the call server or intermediary comprising a Private Branch exchange, the PBX adapted to route incoming calls addressed to any extension, the method comprising: when the wireless handheld telephony device (11, 111) comes into the proximity of the second telephony device (17, 101), pairing of the wireless handheld telephony device (11, 111) and the second telephony device (17, 101); upon pairing, extension information for the wireless handheld telephony device (11, 111) and address information for the second telephony device (17, 101) is communicated to the PBX which then provisions second telephony device (17, 101) with the identity of wireless handheld telephony device (11, 111) such that when an incoming communication for the wireless handheld telephony device (11, 111) is received by the call server from a third telephony device, a notification of the incoming communication is sent (902b, 904b) to the second telephony device (17, 101) and if the communication is accepted by the second telephony device (17, 101), voice data received from the third telephony device is directed (908b, 910b) to the second telephony device (17, 101); wherein during pairing the address information is sent directly from the second telephony device (17, 101) to the wireless handheld telephony device (11, 111) which sends a request, including the address information, for authentication of the second telephony device (17, 101) to the call server which confirms that the address information provided by the second telephony device (17, 101) is not false and the extension information is sent directly from the wireless handheld telephony device (11, 111) to the second telephony device (17, 101) which sends a request, including the extension information, for authentication of the wireless handheld telephony device (11, 111) to the call server which confirms that the extension information provided by the wireless handheld telephony device (11, 111) is not false. when the wireless handheld telephony device (11, 111) comes into the proximity of the second telephony device (17, 101), pairing of the wireless handheld telephony device (11, 111) and the second telephony device (17, 101); upon pairing, extension information for the wireless handheld telephony device (11, 111) and address information for the second telephony device (17, 101) is communicated to the PBX which then provisions second telephony device (17, 101) with the identity of wireless handheld telephony device (11, 111) such that when an incoming communication for the wireless handheld telephony device (11, 111) is received by the call server from a third telephony device, a notification of the incoming communication is sent (902b, 904b) to the second telephony device (17, 101) and if the communication is accepted by the second telephony device (17, 101), voice data received from the third telephony device is directed (908b, 910b) to the second telephony device (17, 101); wherein during pairing the address information is sent directly from the second telephony device (17, 101) to the wireless handheld telephony device (11, 111) which sends a request, including the address information, for authentication of the second telephony device (17, 101) to the call server which confirms that the address information provided by the second telephony device (17, 101) is not false and the extension information is sent directly from the wireless handheld telephony device (11, 111) to the second telephony device (17, 101) which sends a request, including the extension information, for authentication of the wireless handheld telephony device (11, 111) to the call server which confirms that the extension information provided by the wireless handheld telephony device (11, 111) is not false.