Hytera DMR System Planner
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Figure 2.2.4-1: Phone Network System via Local PSTN Gateway
Figure 2..2.4-2: Phone Network System with Multi-site PSTN Gateway
The Phone feature realizes the connection between the repeater and the PSTN
network by transmitting a call and DTMF signaling, so as to achieve the
communications between the radio and the phone. Phone interconnection, a special
form of the DTMF signaling application, is exclusively used for the communications
between radio and phone. Its operation is like this: the radio encodes two specific
tones into the DTMF code to represent for the digital symbols, loads the carrier with
the DTMF code and transmits it to the repeater. When the repeater is connected to
the radio, it will transfer the received DTMF code to the PSTN gateway device for
the communication with the phone. The call and the DTMF code are transmitted
together in this process: the radio transmits a call and an access code to connect to
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