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Wiki HomeQuoted from: http://www.ilbcfreeware.org/
What is iLBC?
- iLBC (internet Low Bitrate Codec) is a FREE speech codec suitable for robust voice communication over IP. The codec is designed for narrow band speech and results in a payload bit rate of 13.33 kbit/s with an encoding frame length of 30 ms and 15.20 kbps with an encoding length of 20 ms. The iLBC codec enables graceful speech quality degradation in the case of lost frames, which occurs in connection with lost or delayed IP packets.
Features
- Bitrate 13.33 kbps (399 bits, packetized in 50 bytes) for the frame size of 30 ms and 15.2 kbps (303 bits, packetized in 38 bytes) for the frame size of 20 ms
- Basic quality higher than G.729A, high robustness to packet loss
- Computational complexity in a range of G.729A
- Royalty-free Codec
News
- 2008-04-02 - iLBC no longer included with Asterisk source (1.4.19 and 1.6); run script contrib/scripts/get_ilbc_source.sh to install (may have to run menuselect/menuselect and go to Codecs section to select iLBC)
- 2004-12-06 - Internet Engineering Task Force (IETF) has approved standardization of the iLBC codec.
- 2004-11-23 - GIPS to Provide Major DSP Chip Manufacturer Infineon with iLBC Speech Codec to Accelerate Time-to-Market Press Release
- 2004-08-09 - GIPS iLBC has been specified as a mandatory codec in the recently released CableLabs PacketCableTM 1.1 Audio/Video Codec
See Also
- Back to Codecs
Page Changes
Problem with iLBC on Asterisk
I use Budgetone 101 as its terminals.
Initially the system is running well, all terminals can talk to each other, but after awhile (1 month approximately) the system is showing rather strange messages. It shows RTP error, unknown codec 99 found.
And the terminals are mute, they can't pass voice to each other.
Anyone knows what this might be caused ?
I use asterisk downloaded as CVS as dated Dec 2004. Don't know what it release number.
Now I change the codec to G.726 and the system returns to its optimum condition.