DTMF Back Tone

The system can be programmed to allow or prevent Dual-tone Multi-frequency (DTMF) tones

from being returned to digital telephones when a user dials on outside lines or sends DTMF digits to a voice mail device.

DTMF and Dial Pulse CO Line Compatibility

When making outside calls, signals generated by pressing the dial pad buttons of a digital telephone are neither DTMF nor rotary dial signals – they are digital signals. The system can be programmed to translate these signals to either DTMF or rotary dial signals as required by the serving CO. Once the connection has been made, any further digits sent will always be sent as DTMF or rotary to allow the operation of devices at the other end of the connection.

DTMF Signal Time

DTMF tones that are sent via Speed Dial to lines and via automatic dialing to voice mail devices can be set to 80 or 160 milliseconds, or continuously. The time can be set system wide independently for line out-dialing and for voice mail automatic dialing.