ITU G.729
Created by: jht2,Last modification on Sat 24 of Mar, 2007 [18:11 UTC] by wiseoldowl
G.729 is an ITU standard codec.
Has two main flavors: A and B, see the ITU G series page for more info.
It offers toll quality speech at a reasonably low bit rate of 8Kbps. However, it is a rather "costly" codec in terms of CPU processing time, therefore some VoIP phones and adapters (notably the Linksys/Sipura/Cisco brands) can only handle one G.729 call (channel) at a time. This can cause calls to fail if the user attempts to use three-way calling, or place simultaneous calls on both lines of a two-line device, and G.729 is the only allowed codec.
Use of this codec in a product requires licensing by Sipro Lab Telecom or VoiceAge if you are in the US and some other countries.
There are some free for non-commerical experimental use implementations for G.729
Asterisk server supports it in pass-thru or with a license
Has two main flavors: A and B, see the ITU G series page for more info.
It offers toll quality speech at a reasonably low bit rate of 8Kbps. However, it is a rather "costly" codec in terms of CPU processing time, therefore some VoIP phones and adapters (notably the Linksys/Sipura/Cisco brands) can only handle one G.729 call (channel) at a time. This can cause calls to fail if the user attempts to use three-way calling, or place simultaneous calls on both lines of a two-line device, and G.729 is the only allowed codec.
Use of this codec in a product requires licensing by Sipro Lab Telecom or VoiceAge if you are in the US and some other countries.
There are some free for non-commerical experimental use implementations for G.729
- http://www.readytechnology.co.uk/open/ipp-codecs-g729-g723.1/ for Asterisk based on Intel libraries
- VoiceAge Windows executable
- Intel Windows and Linux
- The ITU has reference source code available.
- If your are not ITU member and want to download reference code for free:
- Go to ITU Electronic Bookshop;
- Select option #2: "I wish to REGISTER in order to download up to three (3) ITU Recommendations free of charge";
- Receive mail with your access code.
- Select recomendation at http://www.itu.int/rec/T-REC-G.729/e
- Select language and format
- Enter Login/Special ID* and Password and press Login.
- Press button "Download ....."
- NOTE: The descriptions for items with source code say something about "diskettes".
- If your are not ITU member and want to download reference code for free:
VOIP Phone Support
This codec is supported by at least the following phones:- ACT P104SLD IP Phone - SIP IP phone
- Cisco ATA 186 - analogue phone adapter (limited to 1 channel)
- Cisco 79XX - hard phone
- Firefly - IAX softphone (with external DLL)
- Grandstream BudgeTone 100 series IP phones
- Sipura SPA-841 VOIP phone
- Sipura SPA-2000 - analogue phone adapter (limited to 1 channel)
- Sipura SPA-2002 - analogue phone adapter (limited to 1 channel)
- Sipura SPA-3000 ATA
- SNOM phones - SIP IP phone (ie. SNOM190)
- X-Pro
- Zyxel P2000W V2
- Polycom IP 301
- Linksys RTP300 and WRTP54G
Other Resources
Asterisk server supports it in pass-thru or with a license
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