A method for establishing voice communications using a mobile handset comprising: transmitting a radio frequency, RF, signal from said mobile handset to a base station to provide said voice communications; determining when said mobile handset is in close proximity to a Voice over Internet Protocol, VoIP, capable device, to which a communication link can be established if the mobile handset is in close proximity to said VoIP capable device, the VoIP capable device being configured to operate as a softphone or a desktop phone or a personal computer; disabling the transmission of said RF signal to said base station if the mobile handset is determined to be in close proximity to the VoIP capable device; establishing the communications link between said mobile handset and said VoIP capable device; registering the mobile handset with the VoIP capable device; sending a signal to the VoIP capable device from the mobile handset, whereby a VoIP packet corresponding to the signal can be forwarded by the VoIP capable device to a telephone switching device via a network, the telephone switching device being capable of further forwarding the VoIP packet to a communications device to enable a call connection to be established between the mobile handset and the communications device via the VoIP capable device; wherein, once registered, the VoIP capable device acts as a gateway between the mobile device and the communications device and wherein the mobile handset appears to the telephone switching device to be a wireline communication device; and accessing one or more vendor-specific enhanced capabilities and services associated with the VoIP capable device from the mobile handset via the communications link. transmitting a radio frequency, RF, signal from said mobile handset to a base station to provide said voice communications; determining when said mobile handset is in close proximity to a Voice over Internet Protocol, VoIP, capable device, to which a communication link can be established if the mobile handset is in close proximity to said VoIP capable device, the VoIP capable device being configured to operate as a softphone or a desktop phone or a personal computer; disabling the transmission of said RF signal to said base station if the mobile handset is determined to be in close proximity to the VoIP capable device; establishing the communications link between said mobile handset and said VoIP capable device; registering the mobile handset with the VoIP capable device; sending a signal to the VoIP capable device from the mobile handset, whereby a VoIP packet corresponding to the signal can be forwarded by the VoIP capable device to a telephone switching device via a network, the telephone switching device being capable of further forwarding the VoIP packet to a communications device to enable a call connection to be established between the mobile handset and the communications device via the VoIP capable device; wherein, once registered, the VoIP capable device acts as a gateway between the mobile device and the communications device and wherein the mobile handset appears to the telephone switching device to be a wireline communication device; and accessing one or more vendor-specific enhanced capabilities and services associated with the VoIP capable device from the mobile handset via the communications link.