Our OpenPRI series of single and dual span E1/T1 interface cards are offered in a half length PCI or PCI Express (PCI-e) bus form factor. Positioned as an entry level hardware platform where connection to primary rate (digital) lines and legacy PBX phone equipment are desired, it supports both full and fractional E1 and T1 lines and is ideally suited for medium to higher density voice traffic environments.

Typical telephony solutions targeted include:

• Call Recording/Logging.
• Traditional fixed line and IP based PBX phone systems.
• Interactive Voice Response (IVR) answering services.
• Automatic Call Distribution (ACD) systems.
• Announcement systems.
• Computer Telephony Integration (CTI) for contact centers.
• Automated Dialers for contact centers.

Choose from our range OpenPRI hardware below that best meets your telephony requirements:

Product	Telephony Interface	Image	Connects To
OpenPRI Single	1 x E1/T1 span		Primary rate E1/T1 ISDN lines. Supports up to 30 voice channels.
OpenPRI Dual	2 x E1/T1 spans		Primary rate E1/T1 ISDN lines. Supports up to 60 voice channels. Optional PRI tap boxes provide the high impedance (Hi-Z) requirements to "passively" tap these primary rate ISDN as well as T1 (RBS) and E1 (R2) lines for call logging/monitoring purposes. Note: You need 2 E1/T1 spans to passively tap a single E1/T1 line (up to 30 channels).

Voicetronix has made available accessories that when combined with our telephony cards enhance and/or simplify telephony solutions that connect to digital lines. These include:

PRI Tap Box - Passively taps E1/T1 lines.

E1/T1 lines provide full duplex communication through 4 wires (ie. clock & data signals in separate directions - transmit & receive). In order to passively tap these digital lines for PC based call recording/logging applications, Voicetronix has specifically designed a PRI Tap Box that provides a high impedance connection that captures these signals with minimal reflections and feeds them into our OpenPRI dual E1/T1 span cards housed in PC/servers.

You need two E1/T1 spans to record the complete conversation (ie. one span captures the transmit side while the other span captures the receive). Once data (ie voice) is captured in each direction, it is synchronised and combined to provide the recorded call. The PRI Tap Box has four RJ45 sockets providing connection to the telco line, the customer telephone equipment and each of two E1/T1 spans on our OpenPRI cards that run the Logger application.

Note: The PRI Tap Box can only be used with our OpenPRI dual span E1/T1 telephony cards and together are designed to not interfere with the operation of your existing communication equipment. It is possible to use two single E1/T1 span OpenPRI cards, but reflections may increase.

PRI Switch Box - Offers redundancy in case of PC/server or power failure.

The PRI Switch Box is ideal in situations where you are "breaking" the line between the telco and its connection to the customer equipment (usually a PBX) in order to provide, say, a PC based IVR answering service as an add on feature using our OpenPRI cards. In the event the PC/server running the service suffers from a power or PC/server failure the PRI Switch Box will automatically by-pass it by failing over the telco line to the customer PBX phone system. While the customer loses the add on feature, they doesn't lose the ability to make and receive calls. Alternatively the PRI Switch Box can be used to fail over to a redundant IVR server if so desired.

The PRI Switch Box has four RJ45 sockets, one each for connecting to the telco line and customer equipment and two for connecting to our OpenPRI telephony cards. The PRI Switch Box and PC/server communicate through a serial interface.

Product	Physical Connections	Power Requirements	Image	Connection Info
PRI Tap Box	4 x RJ45	None		Connects to OpenPRI dual E1/T1 span cards running the Logger application via two of the RJ45 sockets. The other two RJ45 sockets connect to telco line and customer phone equipment, usually a PBX.
PRI Switch Box	4 x RJ45 & 1 x RJ45 for (serial comms)	12V DC or 9V AC		There is an RJ45 socket available to make connection to the telco E1/T1 line, customer equipment and two E1/T1 spans on the OpenPRI cards. Serial communication is made available by connecting the serial interface on the PRI Switch Box to the PC/server's USB port via our modified serial RJ45 to USB cable.

Telephony applications that our customers predominantly use the OpenPRI cards include call recording, IVR and CTI solutions. All you need to get started on building your own telephony solution is a PC/server running Linux, an OpenPRI card, your choice of open source software and some sweat equity!

If the DIY option is not for you then contact sales for a pre-configured or custom solution.

Typical solutions include:

• Providing call logging/monitoring functionality to existing primary rate trunked PBX phone systems. Take a PC/server with the OpenPRI-Dual card running Linux (ie. Telephony server) and connect the PRI tap box to each E1/T1 span on the card, the telco line and the PBX. Install, configure and run our hardware driver & Logger application software. Note: The Logger solution supports E1/T1 ISDN, T1 RBS and E1 R2 signalling.



• An IVR answering service with CTI capabilities supporting legacy PBX and IP based phone systems. Take a PC/server with an OpenPRI dual E1/T1 span card running Linux (ie. Telephony server) and connect one of the E1/T1 spans to the telco line and the other to the legacy PBX phone system. Install the OpenPRI hardware driver, VPB library and commence developing your own custom IVR and CTI solution. Note: CT server can be installed to make it easier on Perl developers. If you are connecting SIP based handsets then its best to use Asterisk and zaptel to develop your solution.