VTI - PBX for Software Developers

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The Versatile Telecom Interface (VTI) is a PBX that is designed to give software developers full control over the telephone line and provide a link with the PC. It has the following features.

2 telephone line connections. VTI can dial on these 2 lines under PC control. VTI can also monitor tones, such as dial, busy and unobtainable tone. On incoming calls, VTI receives and passes on caller ID to the PC.

6 local extensions. Under PC control the VTI can ring telephones and pass on caller ID to them. It can also receive dialling from the telephones and pass these to the PC.

Audio connections to the MIC and SPK connections of the PC soundcard. VTI can connect these to either the outside telephone line or telephone extensions, under PC control.

Built in Solid-State voice storage. This can be used to program up to 6 short (30 second) messages that can be played to outside telephone line or telephone extensions, under PC control.

Applications: Automated call handling, remote control, home automation etc. Some examples are presented below.

Use of VTI to answer incoming calls and play dedicated message to caller, dependent on their caller ID. e.g. if your wife calls, you can have a private message that plays only if calls received from her mobile. The messages are stored on the PC and played via the sound card.

If for example you get a call from a withheld telephone number, then a polite rejection message could be played automatically and the line hung up.

Every telephone connected to VTI can effectively become control devices for home automation purposes. E.g. pick up the telephone and dial a specific code. PC can now play voice messages to the telephone, using the sound card. These can be voice prompts and the user can send controls via the telephone keypad. For the more adventurous voice recognition may be a challenge.

Similarly, VTI lets outside callers control devices via the PC using their telephone keypad (or spoken commands).

As VTI has 2 lines, it is also possible to transfer certain calls out to mobiles. E.g. the caller could be given the option of leaving a message, or contacting the owner on his mobile. If the latter option is chosen via the telephone keypad, then the second line can be used to contact the owner and the two lines connected.

VTI Functional Spec Datasheet - The functional spec for the VTI datasheet

VTI Manual - The manual for the VTI is available on-line by clicking this link.

Demo Software Special

As part of this offer we are including our DEMO PC-PBX software which is a PC controlled PBX. PC-PBC is a software application that provides for a 2-line telephone system. When this application is used, one can study the COM port commands to get a full understanding of how these are used. Please note this software will not be supported under any circumstances. As this is the case, we will include the source files (VB6) on the installation CD to get you started.