Archive for category g.723.1

Digium Releases TCE400B PCI-Express Transcoder Card

Posted by admin in codecs, digium, g.711, g.723.1, g.729, hardware on June 30, 2009

Digium TCE400B

Digium TCE400B

Digium releases the TCE400B PCI Express card for use with voice applications based on the open source Asterisk telephony platform. The new card provides hardware-based voice compression and decompression (codec) capabilities to shift transcoding from software to hardware. Using the TCE400B in place of a software-only solution places fewer demands on servers and frees up Asterisk to more efficiently process calls and to provide functionality for phone systems such as call recording, conference calling and interactive voice response.

The TCE400B is a half-length, low-profile PCI-Express x1 card for transforming complex VoIP codecs into simple codecs. This product is, essentially, a PCI-Express version of Digium’s existing TC400B product.

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G.729 and G.723.1 codecs x86 and x86_64 Linux and FreeBSD binaries for Asterisk open source PBX

Posted by admin in codecs, g.723.1, g.729 on June 24, 2009

DISCLAIMER: You might have to pay royalty fees to the G.729/723.1 patent holders for using their algorithm.

Sources

To compile the codecs you need Intel IPP libraries installed. Currently only Asterisk 1.4, 1.6 and TRUNK are supported. Support for Asterisk 1.2 and Callweaver is planned, for now use the binaries. Use “g723 debug” and “g729 debug” commands to print statistics about received frame sizes, can aid in debugging audio problems. You need to bump Asterisk verbosity level to 3 to see the numbers.

Binaries

  • choose codec binary appropriate for your Asterisk version and CPU type, use x86_64 for 64-bit mode, scroll to the end of the list for FreeBSD binaries
  • delete old codec_g729/723*.so files (if any) from /usr/lib/asterisk/modules directory
  • copy new codec_g729/723*.so files into /usr/lib/asterisk/modules directory
  • restart Asterisk
  • check the codec is loaded with ‘core show translation recalc 10′ on Asterisk console (‘show translation’ in Asterisk 1.2)
  • G.723.1 send rate is configured in Asterisk codecs.conf file (Linux Asterisk 1.2, 1.4, 1.6, TRUNK and Callweaver, FreeBSD 7.x Asterisk 1.4 binaries only): 
    [g723]
; 6.3Kbps stream, default
sendrate=63
; 5.3Kbps
;sendrate=53

    This option is for outgoing voice stream only. It does not affect incoming stream that should be decoded automatically whatever the bitrate is.

  • in sip.conf or/and iax.conf configure the codec(s) either globally or under respective peer, for example: 
    disallow=all
allow=g729
  • for detailed information about Asterisk configuration visit voip-info.org
  • in case of problems read Notes and Troubleshooting

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Digium TC400B

Posted by admin in codecs, digium, g.711, g.723.1, g.729, hardware on June 19, 2009

Digium TC400B

Digium TC400B

The TC400B is a half-length, low-profile PCI 2.2-compliant card for transforming complex VoIP codecs into simple codecs.

Overview:

The 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 call processing; 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.

TC400B Documentation:

Manuals
01.26.2007 – TC400B User’s Manual (PDF)

Datasheets & Brochures
07.01.2008 - TC400B Datasheet (PDF)

Agreements & Policies
08.02.2007 – Digium End-User Purchase and License Agreement (HTML)

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