Sipura/LinkSys CODEC selection

Problem:

Solution:

1. G.711 (A-law and mµ-law)
This very low complexity codec supports uncompressed 64 kbps digitized voice transmission at one through ten 5 ms voice frames per packet. This codec provides the highest voice quality and uses the most bandwidth of any of the available codecs.

2. G.726
This low complexity codec supports compressed 16, 24, 32 and 40 kbps digitized voice transmission at one through ten 10 ms voice frames per packet. This codec provides the highest voice quality.

3. G.729A
The ITU G.729 voice coding algorithm is used to compress digitized speech. G.729A is a reduced complexity version of G.729. It requires about half the processing power to code G.729. The G.729 and G.729A bit streams are compatible and interoperable, but not identical.

4. G.723.1
The SPA supports the use of ITU G.723.1 audio codec at 6.4 kbps. Up to 2 channels of G.723.1 can be used simultaneously. For example, Line 1 and Line 2 can be using G.723.1 simultaneously, or Line 1 or Line 2 can initiate a 3-way conference with both call legs using G.723.1.

5. GSM – Uses several codec specifications like: Half Rate (5.6 kbit/s),  Full Rate (13 kbit/s),  Enhanced Full Rate (EFR) (12.2 kbit/s) and a variable-rate codec called AMR-Narrowband, which is high quality and robust against interference when used on full rate channels.

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