Digium octal span digital cards are high-performance, cost effective digital telephony interface devices with the power to seamlessly interconnects traditional telephony systems with Voice over IP technologies.

4 out of 5

(1 review)
  • Buy Now

  • Certified

  • Supported


  • 8 T1 / E1 Spans
  • Up to 240 concurrent calls per card
  • Optional hardware echo cancellation module


  • Paid
  • 1TE820F: $1,995
  • 1VPMOCT256LF: $995


Digium’s TE820 Octal-Span digital card is built exclusively for high-density Asterisk® applications that require high-performance, cost effective digital connectivity. The TE820 includes eight independently software-selectable digital telephony interfaces, supporting up to 192 channels (in T1/J1 mode) or 240 channels (in E1 mode) — the highest single-card port density available for use with Asterisk.

The TE820 card supports industry standard telephony protocols, including multiple variants of Primary Rate ISDN. Each span can be configured as either CPE or network for optimal flexibility. The optional VPMOCT256 hardware echo cancellation module, based on the industry-leading Octasic chipset, offloads the task of echo cancellation from the CPU, increasing overall system performance and call quality.

The TE820 card has been designed to be fully compatible with existing software applications and is fully integrated with Digium’s Asterisk software. The open source drivers for Digium cards support an application programming interface (API) for custom application development. The combination of Digium hardware and Asterisk software provides a cost effective platform for building numerous communications solutions, from PBX system and VoIP gateways to call centers and complete unified communications suites. Digium solutions are paving the way for a new generation of worldwide communications.

Framing Types

  • Superframe (D4)
  • Extended Superframe (ESF)
  • Channel Associated Signaling (CAS)
  • Common Channel Signaling (CCS)

Coding Types

  • Alternative Mark Inversion (AMI)
  • Bipolar with Eight (8) Zero Substitution (B8ZS)
  • High Density Bipolar Order Three (HDB3)
  • with optional CRC4

PRI Switch Compatibility

  • EuroISDN (PRI or PRA) — Q.931/Q.921
  • AT&T 4ESS Network or CPE
  • DMS 100 National ISDN 2
  • Lucent 5E CAS Voice Modes


  • 5-year parts and labor
  • Exceptional Satisfaction Policy

Production Quality

  • ISO 9001 Certified

Ordering Details

  • 1TE820F: 8 Span PCI Express
  • T1/E1/J1 PRI Card
  • 1TE820BF: 8 Span PCI Express
  • T1/E1/J1 PRI Card with
  • Echo Cancellation Module
  • 1VPMOCT256LF: 256 Channel Echo Cancellation Module
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Reviewer: williamhanna

over 2 years ago

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Support Details

Fully Supported

Support Contact Information

Digium, Inc


Digium®, Inc., the Asterisk® Company, created and is the innovative force behind Asterisk, the most widely used open source telephony software. Since its founding in 1999 by Mark Spencer, Digium has become the open source alternative to proprietary communication providers, with offerings that cost as much as 80 percent less. Digium offers Asterisk software free to the open source community and offers Switchvox, Digium's Unified Communications solution to power a broad family of products for small, medium and large businesses. The company's product line includes a wide range of telephony hardware and software to enable resellers and customers to implement turnkey VoIP systems or to design their own custom communications solutions. At Digium, we're changing the way businesses communicate.


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Digium Certified

Digium offers certification of selected products to ensure their interoperability with Certified Asterisk as well as Digium's other products. A Digium certified product provides an assurance of quality and interoperability of the product with Asterisk.