The late-model KX-TA624-5 does not have this problem. This seems to be related to inductive spikes rather than power consumption. Note: Early model KX-TA624 units tend to spontaneously reboot when ringing old-style electromechanical ringers.Factory-default configuration will convert pulse dialing on an extension to DTMF on an outgoing CO port.

Sandman PULSE TO TONE CONVERTER (LPT-310).Mitel Smart-1 dialer (requires programming, a little expensive for this only purpose).Dial Pulse Phone Pulse to DTMF converter VOIP FXS port on a SIP ATA.One possible solution (untested) is a Dial pulse to DTMF (Touchtone) converter between the rotary dial phone and the VOIP FXS port Example: I seem to remember that auto mode was supposed to adapt line voltage depending on loop current to a maximum of 55mAH delivered, but in practice they were often hard-jumpered to produce a desired voltage.Many VOIP devices with FXS ports do not support traditional rotary dial phones.

from (long distant) memory you can have auto, 60v, 78v or 100v settings. if the no-CPE loop resistance is such that the terminating current falls below 20mAH then a Telspec or Plessey SLE 238/211 would be fitted at the conditioning/long line rack in the exchange, jumpered to boost line voltage from the 50v nominal. that means a 1500 ohm loop resistance (not including CPE) and a minimum 250 KOhm unlooped resistance at 3uF of terminating capacitance - which means three of the old phones, or any of the modern ones designed to emulate this. Modern Telstra phones are, in fact, designed to emulate this handset from an electrical sense.Īll exchanges will deliver about 50 mAH at the DAC, and regardless of that, there is a legally mandated statutory requirement for Telstra to deliver 20mAH of loop current to the premises.

Dtmf converter