G.729/G.729a

G.729 and G.729a are compatible. The only difference is on the encode site. In RTP stream, both G.729/G.729a use the same payload type(15).


The following is from the IEEE.

This article describes the ITU-T Recommendation G.729 Annex A
(G.729A) for encoding speech signals at 8 kb/s with low complexity. G.729A
is the standard speech coding algorithm for multimedia digital simultaneous
voice and data (DSVD). G.729A is bitstream interoperable with G.729; that
is, speech coded with G.729A can be decoded with G.729, and vice versa. OF CLIP>