Abstract: A radio-to-SIP adapter is shown to include a voice detection algorithm processor as well as other circuitry to provide an interface between a radio and SIP adapter to accommodate a transition from half duplex to full duplex and to cause a radio to transmit when human speech is present in an audio signal from a telephony network.

Abstract: A portable interconnection system has a housing having and a plurality of communications ports adapted for connection to a plurality of audio communication networks; electronics substantially enclosed by the housing; the electronics including at least interconnection electronics operative to selectively establish a plurality of independent connection sets, each connection set interconnecting at least a plurality of the communications ports for communications between a plurality of audio communication units operating in at least two different and incompatible ones of the audio communication networks; a user interface connected to the interconnection electronics and operative to control the interconnection electronics; wherein a combined weight of the housing and the electronics is not more than fifteen pounds. A display may show an interconnection status of the plurality of audio communication units for a plurality of the independent connection sets simultaneously.