dual-tone multi-frequency signaling technical , DTMF (Abkürzung)

The system utilised dual-tone multi-frequency signaling (DTMF) that was unique at the time.

An example is dual-tone multi-frequency signaling (DTMF), which is used on most telephone lines to customer premises.

Dual-tone multi-frequency signaling (DTMF), fax transmissions, and high-quality audio cannot be transported reliably with this codec.

Until the 1960s dials used almost exclusively the rotary technology, which was replaced by dual-tone multi-frequency signaling (DTMF) with pushbutton telephones (A4).

The Sender was able to accept Dial Pulses and (in later models) dual-tone multi-frequency signaling (DTMF).

For example, when dialing from a land-line telephone, the telephone number is encoded and transmitted across the telephone line in form of dual-tone multi-frequency signaling (DTMF).

Based on this prior success with using MF by specialists to establish long-distance telephone calls, dual-tone multi-frequency signaling was developed for end-user signaling without the assistance of operators.

Other protocols used for text telephony are European Deaf Telephone (EDT) and Dual-tone multi-frequency signaling (DTMF).

When Touch-Tone service was introduced in the 1960s, the dual-tone multi-frequency signaling (DTMF) tone generator also required correct polarity as it depended on the line power for operation.

Dual-tone multi-frequency signaling (DTMF) is an in-band telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and switching centers.

It features floats and live performers covered in thousands of electronically controlled lights and a synchronized soundtrack controlled by a Dual-tone multi-frequency signaling (DTMF) tone broadcast along the parade route.

Moreover, the SIP INFO method extension is designed to carry user information between terminals without affecting the signaling dialog and can be used to transport the dual-tone multi-frequency signaling in order to provide classic telephone keypad services to users.