If the Dial Tone Required field is set to Y in the System Configuration of the GTI Configurator, then the absence of dial tone, for whatever line type (E&M or End-to-End), will cause the Site Controller to initiate a rotary hunt to get an available telephone line. The Site Controller will apply a rotary hunt tone to the calling radio. If all of the lines are exhausted by the rotary hunt, the call is dropped (for more information, see the rotary hunt parameters in the Configuration section of this manual).
14.When the line-connected GTI detects dial tone (or E- lead signal) (or if Dial Tone Required is N and the Dial Tone Seek Time is up), it sends a dial tone detected message to the Site Controller. The caller should hear a dial tone (but will hear nothing for an E-lead signal).
If the Site Controller does not receive the dial tone detected message within the Dial Tone Detect Duration in the Site Controller Personality, the Site Controller will initiate a rotary hunt for an available telephone line. The Site Controller will apply a rotary hunt tone to the calling radio. If all of the lines are exhausted by the rotary hunt, the call is dropped (for more information, see the rotary hunt parameters in the Configuration section of this manual).
15.The Site Controller sends the interconnect digits (that have been trapped and stored) to the line-connected GTI for re-dialing (DTMF or pulse dial) to the connected line. The caller should hear these DTMF tones or dial clicks (pulse dial) as the digits are dialed.
16.The Site Controller directs the line-connected GTI to look for DTMF digits (to detect the pressing of the # key by the telephone user to end the call).
OVERDIALED DIGITS
17.If the telephone interconnect number was only a partial telephone number, the caller must now supply the remaining digits of the telephone number as overdialed digits. These overdialed digits are sent as DTMF tones directly through the channel-connected GTI and line- connected GTI to the telephone line, without trapping and re-dialing. All overdialed digits are logged into the call record.
ENDING THE CALL
18.The normal method to end a radio-originated telephone interconnect call is for the caller to press the EXIT, SPC, or a designated button on the radio (see the operator's manual for the radio). This causes the radio to transmit a digital end-of-call signal to the assigned working channel GETC. (The telephone end can also terminate the call, by pressing the # key for one second or by hanging up.)
19.The assigned Working Channel GETC receives the end- of-call signal from the calling radio, and sends end-of- call information to the Site Controller.
20.When the Site Controller receives the end-of-call information from the Working Channel GETC, or the Transmission Conv Limit is exceeded (see System Manager screen 10, panel 2.), the Site Controller first directs the channel-connected GTI to extract itself from the audio loop of the assigned Working Channel, then directs the line-connected GTI to hang-up the line, and finally directs the assigned Working Channel GETC to terminate the call.
