Digital Telephony Cards

B23X Series
Digital Cards

The B23X series is Sangoma’s line of BRI telephony cards designed for Asterisk, FreePBX and PBXact phone systems for the European (UK) region. Make up to 4 crystal clear BRI calls on a single interface. All BRI cards support software-selectable digital telephony interfaces for either NT or TE mode without requiring jumpers.

Sangoma’s BRI cards are available in PCI and PCI-Express form factors. All models include onboard echo cancellation to give your calls crystal clear sound quality without the need for additional boards, modules, or backplane connectors.

B23X Series
  • 1B233LF - Two (2) span digital EuroISDN BRI PCI-Express card
  • 1B234LF - Two (2) span digital EuroISDN BRI PCI card

Key Features and Benefits


2-port/4 voice channels over 4-wire S/T interface.


Software configurable NT and TE modes (jumper-less).

Available Configurations

Supports PCI and PCI-Express form factors
Half-length, low-profile.

Hardware Echo Cancellation

Onboard DSP-based echo cancellation for superior voice clarity.



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.



Use inside a server of your choice, powered by Linux/Windows, to create a SIP-TDM Gateway with your legacy analog 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.



  • Interfaces: 2 span 4-wire S/T interface
  • 2U form factor
  • 127mm x 81mm for use in restricted chassis
  • PCI or PCI Express
  • Fully PCI 2.2 compliant, and X1 PCI express
  • Autosense compatibility with 5 V and 3.3 V PCI busses
  • Single synchronous PCI interface for all ports
  • 32 bit bus
  • 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