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G.729 is a high complexity algorithm, and G.729A (also known as G.729 Annex-A) is a medium complexity variant of G.729 with slightly lower voice quality. All platforms that support G.729 also support G.729A.

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Posted by sagitraz

G.729 is compression standard and G.729a is the extension of G.729.
And both provide different compressing rates.

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Posted by waqqas1

G.729 is an audio data compression algo for voice that compresses voice audio in chunks for 10 millisecond. G.729 does coding for speech at 8 kbps But G.729 a is extension of G.729 which provide 6.4 kbps and 11.8 kbps.

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Posted by HamidAliKhan