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I assumed your old-fashioned phone works in Pulse (Rotary) mode only. Maybe the Tel Company or the Private Tel Exchange in your house supports only DTMF (Dual-tone Multi frequency) or MF (Multi Freq.) tone.
Pulse dialing is a holdover from Rotary phones, which when the rotor is turned and let go, counts out the number you entered in clicks on the telephone line. Pulse, or DTMF (Dual-tone multi-frequency), uses two overlaid tones (one for row and one for column) to signify a button press.
To change the dialing from pulse to dtmf dialing on a prostar 816 you first need to be at a display set (doesn't matter what the extension number is). with the handset down, enter #20 the screen should say MMC DISABLED 1) enter in 1 2 3 4 1 # (that enables programming) 2) enter in #42 the screen should momentarily say trunk dial typethen display the current programmed data (00000000) 3) enter in 0 for pulse dialing and 1 for dtmf dialing for each of the lines. i.e. touch tone dialing for lines 1-4 would be 11110000. all 8 digits must be entered for the program to accept the data press # when finished.
If it dials O.K., try pressing # and see if it turns on the DTMF pad. You could have pulse dial on outside calls enabled, and that would keep the keypad in pulse mode until it's told to send tones.
This is really only a guess. The type of dialing is programmed in CO trunks and it's possible it's been set to Call Blocking! It is designed to send pulse only and block the audio of DTMF so the CO won't get confused. You might start with changing the Type Dial to DTMF and test. If that doesn't work, try Pulse and test. Last, if that doesn't work, you will need to keep call blocking and try the # after dialing.
Please comment back if it does or doesn't work. We don't see much pulse dial around here.
If you have the current firmware for your modem, it should work with pulse. Arris had to make it's MTA's pulse compatible due to old alarm systems that still utilize pulse dialing.
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