Digium is the innovative force behind Asterisk®, the world's most widely used open source telephony platform. In addition, Digium develops the software, hardware, and other components you'll need to create a unified communications solution for a small or medium business. Digium provides a variety of VoIP communications solutions to fit the needs of small, medium and large businesses. The Digium product line includes turn-key business phone systems as well as telephony interface cards, Asterisk software and other components needed to create custom telephony solutions.

Digium TC400B is a bundle of the half-length, low-profile PCI-2.2 compliant 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 to complete additional callprocessing; but also provides Asterisk® with the capability of bridging G.723.1 compressed audio into other formats, a capability not previously possible.

The TC400B decompresses G.729a (8.0kbit) or G.723.1 (5.3kbit) into u-law or a-law; or, compresses u-law or a-law into G.729a (8.0kbit) or G.723.1 (5.3kbit). The TC400B 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 associated with Digium's software-based G.729a codec licensing.

Additional Information/Documentation

• Product Datasheet

MAPLELEAF's Product Warranty Period: 2-years.

Availability: Immediate/In-Stock.

Digium offers an implementation of G.729 that is compatible with Asterisk® and is properly licensed from the intellectual property rights and patent holders. The requirements of the GNU Public License (under which Asterisk® is most commonly distributed) make this proprietary software codec incompatible from a licensing perspective. To resolve this license incompatibility, Digium grants an exception to the GPL for customers of this G.729 Codec.

By properly licensing this patent-encumbered technology and by granting an exception to the GPL to its customers, Digium makes possible the use of G.729 with Asterisk.

Each Asterisk® server that you want to perform G.729 transformations will require its own license key. Therefore, if you have Asterisk® in multiple locations, then G.729 must be installed and licensed separately at each location. Use of G.729 with Asterisk® does not interfere with the use of any Digium telephony interface cards.

Please note that one license key will be generated for each order line item. Each license key is good only for the number of channels for which it is generated. To license, for example, five (5) G.729 channels on an Asterisk® server in Berlin and five (5) G.729 channels on an Asterisk® server in Paris, please place two separate line items in your basket for five (5) channels each. Do not make a single order for ten (10) channels, as you would only be delivered a single key for 10 channels that could only be used in one, not both, locations. You may add additional channels later by purchasing and registering additional license keys, even on the same Asterisk® server.

The license key generated is intended for use on a single Asterisk® server and must be registered to the server on which the G.729 Codec will run. We strongly recommend that after registering the license key that you make a backup copy of the license file that is created as a part of the registration process.

Note: The Digium G.729 Codec is supported on Linux x86 and x86_64 environments only.