Voice Modem Functionality and DTMF Detection

Voice Modem Functionality is supported with Fax Voip Virtual COM Ports (modems). Fax Voip T.38 Modem can operate not only with faxes, but also with voice messages.

Voice Modem Functionality – possibility to operate as Voice Modem. In other words, the following functions are possible:

Playing a voice message to the telephone line.
Recording the voice from the telephone line.

In the recording process, a modem transforms sound signals into digital Voice Data Format. When playing a voice message, a modem transforms digital signals into sound signals.

Facsimile Command Set is used to control the Fax Functions. Fax Voip T.38 Modem operates as Fax Class 1.

Voice Command Set is used to control the Voice Functions.

DTMF Detection feature allows to recognize the DTMF signals in the Voice mode. This can be used when operating with voice and fax mailboxes.

Voice Data Formats and Voice Command Sets supported by Fax Voip T.38 Modem are discussed below.

Voice Modem Functionality are supported by the Fax Voip 14.4K TAPI Voice-Fax Modem driver via TAPI and not only in the passthrough mode.

Depending on the capabilities of your Voice-Fax-Modem software, Voice Modem Functionality and DTMF Detection allow to realize the following functions:

Answering Machine functionality
Voice announcement before fax sending or fax receiving
Sending of voice messages.
Operatinging with different systems for voice and fax (Voice and Fax mailboxes).
Remote answering machine control.
Listening to a telephone line through your computer speakers.

Due to the lack of common standards for voice modems, the behavior of different Voice-Fax-Modem programs may vary. In other words, voice modem functions can be supported in part. A full set of described voice features is supported in the case of using Fax Voip T.38 Modem with Venta Fax & Voice program. A detailed description of how to configure the Venta Fax & Voice to operate with Fax Voip T.38 Modem can be found in the the Using Fax Voip T.38 Modem with Venta Fax and Voice chapter of this user manual.