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The Most Reliable and Flexible Digital BRI Telephony Card on the Market

Sangoma’s award winning ISDN BRI telephony cards are renown for their premium quality and dependability and are powering the world’s SMBs and SOHO businesses who still rely on BRI telephone lines for primary access to the PSTN. They are also the most flexible on the market, with superior compatibility in most commercially available servers and motherboards, and supported in most Linux and Windows operating systems. They are the number 1 choice amongst Asterisk, FreePBX, and Voice API integrators.

14 Ways Sangoma Cards Makes Asterisk Better

The A500 Digital BRI Telephony Card

Sangoma A500 S/T BRI telephony card delivers superior audio quality and scalability from 2-24 ports of BRI, all using a single interface slot on your server! Simply add a remora daughter board to expand up to 24 ports. That’s up to 24 simultaneous PSTN calls in a 2U form factor. Its module design allows it to be configured as TE or NT by simple inverting the colour-coded module! Optional on-board telco-grade echo cancellation offers superior audio quality as well as reduced CPU usage providing optimized system performance

  • 2-24 port scalable BRI card of mixed TE and NT interfaces via 4 wire RJ45 jacks.
  • Up to 24 simultaneous PSTN calls
  • Available in PCI and PCI Express in 2U form factor
  • One colour coded S/T module servers as both TE or NT
  • Carrier-Grade hardware Echo Cancellation options
  • Includes on-board diagnostic tool kit
  • Supports most motherboards & servers
  • Linux and Windows Supported
  • Supports Asterisk, FreePBX, proprietary PBX, IVR and more
  • Life time Warranty

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Use Cases

Install Sangoma award winning telephony cards into your own hardware to create the following types of solutions

PSTN Trunking
Use inside a server of your choice, powered by Linux/Windows, to create a SIP-TDM Gateway to allow IP-PBX to route calls to traditional PSTN.
SIP Trunking
Use inside a server of your choice, powered by Linux/Windows, to create a SIP-TDM Gateway with your  legacy BRI based PBXs to replace expensive analog line connections with SIP trunking to allow reduced call costs, reduced line rental, and bring extra flexibility and disaster recovery.

Card Features

PBX Support
  • FreePBX
  • PBXact UC
  • Asterisk
  • FreeSWITCH
  • Etc
Diagnostic Tools
  • SNMP
  • System logs
Server and Motherboard Support
  • Compatible with most commercially available servers and motherboards
DSP Echo Canceller
  • G.168-2002 echo cancellation in the hardware
  • 1024 taps/128 ms tail per channel on all channel densities
  • DTMF decoding and tone recognition
  • Voice quality enhancement: music protection, acoustic echo control and adaptive noise reduction
  • No CPU load as a result of echo cancellation
  • Does not increase the physical size of the card, and no additional slot is required
Operating System Support
  • Windows 2003, Windows XP, Windows Server 2008, Windows Vista, Windows 7
  • Linux (All versions, releases and distributions from 1.0 up)
Wiring Connections
  • One S/T BRI module has two S/T four wire interfaces
  • 2m 8-pin RJ45 port splitter cables included

Card Specifications


Telephony Interfaces
  • 2-24 ports of BRI (Scalable)
  • Mix TE and NT modes, as required
PCI Interfaces
  • PCI or PCI Express
  • Fully PCI 2.2 compliant, compatible with all commercially available motherboards, and shares PCI interrupts
  • Autosense compatibility with 5 V and 3.3 V PCI busses
  • Single synchronous PCI interface for all ports
  • 32 bit bus master DMA data exchanges across PCI interface at 132 Mbytes/sec for minimum host processor intervention


  • 2U form factor
  • 187mm x 55mm for use in restricted chassis
  • Includes both standard and short half-height compatible mounting clips for installation in 2U rack-mount servers
  • Compatible with all commercially available motherboards
  • Temperature range: 0 – 50 °C
  • FCC Part 15 Class A
  • FCC Part 68
  • CE
  • TBR3
Power Supply
  • 800 mA peak, operational 300 mA max at +3.3 V or 5 V