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difference between the CDMA and GSM and ITU-T Vocoders

Started by Lingadevaru April 22, 2003
Hi all,
If any one knows the difference b/n CDMA, GSM and ITU-T vocoders, please
give your valuable inputs.
Why can't we use GSM vocoders itself in CDMA and vise versa?
Is there anything specific reason for to use the particular vocoders in
praticular network?
All speech codec uses LPC,Pitch, codebook search(adaptive and fixed).
Then what exactly the major difference in these vocoders used in CDMA
and GSM. Thanks in advance.

Regards
-L.Devaru