The OpenVox D210P is a half length ISDN (Integrated Services Digital Network) PRI (Primary Rate Interface) PCI (Peripheral Component Interconnect) card. The D210P provides two single span PRI/E1/T1/J1 ports selectable on a per port basis, which makes it an ideal cost effective option for small to medium sized enterprise applications. OpenVox are a Fonality® Authorized / Certified Ecosystem (FACE) partner and the OpenVox D210P is officially certified for use with Trixbox®.

The OpenVox D210P supports industry standard telephony and data protocols, including both Robbed-bit Signaling (RBS) and Primary Rate ISDN (PRI) protocol families for voice and PPP, Cisco HDLC, and Frame Relay data modes. The board drives both line-side and trunk-side interfaces, including call features. The OpenVox D210P is 100% hardware compatible with Digium® TE210P and uses the same Zaptel wct4xxp device driver.

Standard PC (Personal Computer) hardware can be used along with D210P cards to provide a low cost migration path from legacy ISDN PBXs towards an Open Source IP PBX based solution. The D210P is compatible with leading open source IP PBX software such as Asterisk®, Trixbox®, and Elastix® (OpenVox are an Elastix® Strategic partner), which support all the sophisticated features of expensive high-end PBX/Voicemail platforms. Although developed primarily for Open Source IP PBX Asterisk® based applications, the D210P can be used for any Linux applications/systems that require ISDN connectivity, e.g. Linux ISDN firewalls, VoIP gateways and routers.

• E1 or T1/J1 mode selectable on a per port basis
• ISDN PRI interface: 30 B channels (E1) or 24 B channels (T1/J1), 1 D channel for signalling
• Terminal Equipment (TE) and Network Termination (NT) mode support
• Supports both voice and data modes on its single span, e.g. the card can support 15 channels dedicated to voice for Asterisk/Trixbox and 15 to data
• Meets international standards: Primary rate 2048 kbit/s according to ITU-T G.704 (E1) and 1544 kbit/s according to ITU-T G.704 and JT G.704 (T1/J1)
• Integrated analogue receive and transmit circuitry for long/short haul applications
  
• FIFO buffers (128 bytes deep) for efficient transfer of data packets
• Hardware based HDLC controllers with support for bit stuffing, CRC check and generation, flag generation, flag and address recognition, and handling of bit oriented functions
• Clock generator for jitter-free system/transmit clocks per channel
• Full hardware and software compatibility: Compatible with most well known brands of open source computer telephony equipment

• High-Level Data Link Control (HDLC) defined in ISO 13239
• Cisco HDLC (cHDLC) developed by Cisco Systems
• Point-to-Point Protocol (PPP) defined in IETF RFC 1661
• Multilink PPP defined in IETF RFC 1990
• Frame Relay defined in ITU Q.922 / Q.933 and ANSI T1.618 / T1.617

• EuroISDN (PRI or PRA) - Q.931/Q.921
• NI1: National ISDN 1
• NI2: National ISDN 2
• 4ESS: Class 4 telephone Electronic Switching System (AT&T)
• 5ESS: Class 5 telephone electronic switching system (Alcatel-Lucent)
• DMS100: Digital Multiplex System 100 (Nortel)

• Ear and mouth (E&M) wink start
• Ear and mouth (E&M) channel signaling with feature group B support
• Ear and mouth (E&M) channel signaling with feature group D support
• FXO / FXS Groundstart
• FXO / FXS Loopstart
• FXO / FXS Loopstart with Disconnect Detect
• Multi-Frequency Code R2 (MFC/R2) Signalling - Requires patch (http://www.voip-info.org/wiki/view/Asterisk+MFC+R2)
• Signaling System #7 (SS7) - Requires OpenSS7 (http://www.openss7.org/)

• Fully PCI 2.2 compliant: Auto-sense compatibility for both 5v and 3.3v PCI busses
• High performance bus master with up to 2kbps FIFO
• Industrial Grade Surface Mounted Electronic Components: Minimal Signal Interference, Reduced Heat Transference and Increased Reliability
• Solid tantalum capacitors: High volumetric efficiency/reliability, low Equivalent Series Resistance (ESR) and temperature stability over the range -55°C to +85°C
• Crystal-less wander and jitter attenuation/compensation according to TR 62411 and ETS-TBR 12/13
• Data and clock recovery using an integrated digital phase-locked loop
• Maximum line attenuation up to -43 dB at 1024 kHz (E1) and up to -36 dB at 772 kHz (T1/J1)
• Meets the following Jitter Specifications: ITU-T I.431, G.703, G.736 (E1), G.823 (E1) and AT&T TR62411 (T1/J1)
• Uses latest RoHS compliant Infineon QuadFALC E1/T1/J1 Framer and Line Interface Component (PEF 22554 HT V2.1)
• Dimensions excluding PCI bracket (H x L x W): 103mm x 127mm x 15mm / 4.1 " x 5.1 " x 0.6"
• ROHS compliant: No lead in the Printed Circuit Board (PCB) or parts
• Certificates: CE, FCC

A spare PCI 2.2 slot is required, both 5v and 3.3v PCI buses are supported. The minimum requirements to support the card are: 800MHz processor, 128MB RAM, Linux kernel 2.4.X or 2.6.X (2.6.X recommended).

IP PBX system requirements are dependant on the open source telephony software being used and on the number of simultaneous calls to be supported. Two examples are provided in below: