Digium TC400

VoIP Transcoding PCI 3.3/5.0V card for 120 G.729a or 92 mixed channels of G.729a/G.723.1

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  • Certified

  • Supported


  • DSP based codec transformations for Asterisk in a PCI form factor
  • Up to 120 G.729a or 92 G.723.1 transformations
  • Codec licensing included


  • Paid
  • $1424.50 USD


The TC400B is a bundle of the half-length, low-profile PCI TC400P base card and the TC400M voice processing module. The TC400B is designed to handle, in dedicated DSP resources, the complex codec translations for highly compressed audio as would otherwise be processed by Asterisk in software. Asterisk, in software and with Digium G.729a licensing, is capable of transforming the G.729a codec into other codecs for the purposes of call origination or termination, bridging disparate calls, or VoIP to TDM connectivity. These transformations in software are very expensive, in terms of MIPS, and require a substantial amount of CPU time to accomplish.

The TC400B not only relieves the CPU of this duty, freeing it up to handle other tasks or complete additional call processing, but also provides Asterisk with the capability of bridging G.723.1 compressed audio into other formats, a capability not otherwise possible. The TC400B decompresses G.729a (8.0kbit) or G.723.1 (5.3kbit/6.0kbit) into G.711 u-law or a-law; or compresses G.711 u-law or a-law into G.729a (8.0kbit) or G.723.1 (5.3kbit). The TCE400B is rated to handle up to 120 bi-directional G.729a transformations or 92 bi-directional G.723.1 transformations.

The TC400B does not require additional licensing fees for the use of these codecs nor does it require the registration process association with Digium's software-based G.729a codec licensing.

Available parts and accessories -
1TCE400BLF: VoIP Transcoding PCI-Express x1 card for 120 G.729a or 92 mixed channels of G.729a/G.723.1
3244-00010: Low profile bracket for TC400 and TCE400 VoIP transcoding cards

Supported Codecs -
G.729a, G.723.1 (5.3/6.3kbit decode, 6.3kbit encode), G.711 ulaw/alaw

Warranty -
Five years parts and labor including Digium's 30-day Exceptional Satisfaction Policy.

Operating Systems -
32 and 64-bit Linux environments
Linux Kernel 2.6.x

Voice Applications -

Safety Certifications -
UL 60950-1:2003, First Edition
CSA C22.2 No. 60950-1-03 1st Edition April 1, 2003
IEC 60950-1:2001 First Edition
EN 60950
AS/NZS 60950

Telecom Certifications -
Not Applicable

Emissions -
47 CFR Part 15, Subpart B / 47 CFR Part 15, Subpart B, Class B
EN 55022:1998 Class B / EN 55022:1998 Class B Radiated and Conducted
EN 55024:1998 / IEC 61000

Immunity -
EN 55024 ITE, EN 61000

Physical -
Size: 4.69" x 2.52" x 0.63" (11.9 x 6.4 x 1.6 cm)
Weight: 2.5 oz (70.9 gm)

Environment -
Temperature: 0 to 50C (32 to 122F) operation; -20 to 65C (4 to 149F) storage
Humidity: 10 to 90% non-condensing

Power -
3.3V: 4 Watts, Maximum

Production Quality -
ISO 9001:2001

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Support Details

Digium provides case-based e-mail and phone support from Monday-Friday, 7am-8pm, CST/CDT (GM -6/-5).

In addition, Digium provides online documentation and knowledge base articles accessible from its website.

Other community-based support offerings are available including online mailing lists, an IRC channel and forums.

For links to each, please visit the Digium website

All new Digium telephony cards come with a 5 year warranty and are backed with Digium's Exceptional Satisfaction Policy. See Digium's website for more information about product warranties.

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.