A device-specific interface (1, 10, 20) for interfacing a first device directly to a particular second device (3, 13, 23) in a voice communications system, where the device-specific interface (1, 10, 20) is specific to the particular second device (3, 13, 23) and the second device requires particular settings to be used by the first device when exchanging data with the second device, the interface comprising: - first and second (II, III, IV) connectors for releasably connecting the interface to the first and second devices, respectively; - an electronic data connection between the first connector and the second connector; - an integrated circuit (5, 15, 25) comprising a memory holding digital information relating to identification of the particular second device and relating to particular settings to be used when exchanging electronic data with the particular second device via the electronic data connection; and - a digital data interface between the first connector and the integrated circuit enabling the first device to access the digital information, wherein - the digital information comprises settings specific to the particular second device to be used by the first device when exchanging electronic data signals with the second device and wherein the device-specific interface is adapted to provide the digital information comprising settings specific to the particular second device to the first device thereby enabling the first device to automatically adapt its settings and/or functionality according to the settings specific to the particular second device, - the device-specific interface (1, 10, 20) is a push-to-talk interface and the first device is a push-to-talk device, - the electronic data connection of the device-specific interface is a wire or cable between the first connector and the second connector, and - the integrated circuit and the memory are embedded in the wire or cable or in the first or second connector so that they are physically part of the interface. - first and second (II, III, IV) connectors for releasably connecting the interface to the first and second devices, respectively; - an electronic data connection between the first connector and the second connector; - an integrated circuit (5, 15, 25) comprising a memory holding digital information relating to identification of the particular second device and relating to particular settings to be used when exchanging electronic data with the particular second device via the electronic data connection; and - a digital data interface between the first connector and the integrated circuit enabling the first device to access the digital information, - the digital information comprises settings specific to the particular second device to be used by the first device when exchanging electronic data signals with the second device and wherein the device-specific interface is adapted to provide the digital information comprising settings specific to the particular second device to the first device thereby enabling the first device to automatically adapt its settings and/or functionality according to the settings specific to the particular second device, - the device-specific interface (1, 10, 20) is a push-to-talk interface and the first device is a push-to-talk device, - the electronic data connection of the device-specific interface is a wire or cable between the first connector and the second connector, and - the integrated circuit and the memory are embedded in the wire or cable or in the first or second connector so that they are physically part of the interface.