The following table summarises the main features of the OpenLine4 card:

The OpenLine4 card offers the application developer:

• Four terminating analogue Loop-Start (FXO) telephone ports. These ports are functionally and electrically equivalent to a telephone and are capable of terminating lines from an external exchange or PBX.
• Robust loop drop detection - suitable for the North American telephony network in detecting far end hang up.
• DTMF generation and cut-through detection. Cut-through detection enables the detection of DTMF tones whilst a voice message is playing. This is an essential feature in IVR, Auto-Attendant and Voicemail systems where experienced users can immediately press a specified digit on their telephone keypad to access the system without waiting to hear an entire voice prompt.
• Call Progress Analysis - monitors outgoing call activity including dialing, busy, ringback and disconnection.
• Generation and detection of up to 10 user-defined programmable tones per channel - ideal for generating and detecting call progress tones from proprietary PABXs and the PSTN simultaneously.
• Integrated Caller Identification - provides telephone number information on the calling party before the call is answered. With this module, CT applications can pop vital caller information on operators screens or direct callers to appropriate operator queues before the calls are answered. This is a powerful feature in call centre applications.
• Integrated DSP Echo Cancellation - improves the accuracy of the DTMF cut-through detection algorithm and the audio quality in VOIP gateway applications in circumstances where echo is prevalent.
• Software bridging enables the OpenLine4 card to bridge 2 or more channels - suitable for Call conferencing applications.
• A comprehensive open source API that provides total control over the design of feature rich CT applications.
• Support for the leading operating systems including Linux, FreeBSD, Windows 98/2000/XP/NT.
• Higher port densities solutions by simply installing multiple cards within a PC chassis.
• Integration with other Voicetronix hardware to create a Communications Server that provides PC based feature rich telephony services.
• Support of free Open Source application software.