Two-way radio based unified communications system

摘要

A system for establishing two-way calls between a radio and a phone system is provided. The system comprises at least one control station for exchanging messages with the radio, at least one interconnect control station, or pair of interconnect control stations, for communicating audio signals to and from the radio over a communication channel comprising respective transmit and receive frequencies, and a gateway for exchanging messages with the phone system, the control station and the at least one interconnect control station, or pair of interconnect control stations, causing the radio to switch to the communication channel whereby audio is transmitted from the phone system to the radio over the transmit frequency and audio as well as DTMF is transmitted from the radio to the phone system for activating special features of the phone system.

主权项

1. A system for establishing two-way calls between a radio one or more two-way push-to-talk radios and a packet-based private branch exchange, comprising:
at least one control station operable to exchange messages with said one or more two-way push-to-talk radios over a radio frequency signaling channel and to establish audio communication with said one or more two-way push-to-talk radios over an assigned radio frequency communication channel corresponding to a channel frequency; a gateway operable to: (i) exchange packet communications including signaling messages with said packet-based private branch exchange, (ii) assign at least one communication channel to said one or more two-way push-to-talk radios in response to a call request from the packet-based private branch exchange or one or more of said two-way push-to-talk radios, (iii) convert between analog audio for sending to and receiving from said one or more two-way push-to-talk radios and digital audio packets recognized by said packet-based private branch exchange; and (iv) convert audio tones for activating special features of said packet-based private branch exchange; and said at least one control station being operable to forward a channel assignment message from said gateway to one or more of said two-way push-to-talk radios over said signaling channel to cause said one or more two-way push-to-talk radios to switch to at least one assigned communication channel to establish audio communication with said at least one control station over said at least one assigned communication channel, said at least one control station being further operable to transfer audio including audio tones for activating special features of said packet-based private branch exchange between said one or more two-way push-to-talk radios and said gateway.