Abstract: A communications assembly including a first mobile station communicatively coupled to a public mobile radio network, a second mobile station communicatively coupled to a private mobile radio network, and a communications interface module configured to provide a communication conduit between the first mobile station and second mobile station, for routing: a communication originating from the first mobile station through the communications interface module for transmission over the private mobile radio network via the second mobile station, and a communication initiated at the communications interface module for transmission over the public mobile radio network via the first mobile station device.

Abstract: A communications assembly, comprising a first device (130) operable for a public mobile radio network (168) such as a cellular telephony network, a second device (102) operable for a private mobile radio network (166) such as a TETRA network and a communications interface module (170) configured to provide a communications conduit between said first (130) and second (102) devices over a local communications medium is disclosed. The communications interface module (170) is configured to route a communication originating at said first device (130) through said communications interface module (170) to said second device (130) for transmission over said private mobile radio network (166). Optionally or additionally a communication initiated at said communications interface module (170) is routed to said first device (130) for transmission over said public mobile radio network (168).