OK Thanks.

Pretty messy... But I guess it is the price of backward compatibility.

-----Original Message----- From: Simao Campos [mailto:simao.campos@labs.comsat.com] Sent: Friday, December 01, 2000 11:00 AM To: Audet, Francois [SC2:4K02:EXCH] Cc: ITU-SG16@mailbag.cps.intel.com Subject: G.729 in H.245v7

Francois

...

So my question is: when are the Annex A and Annex B flag used in g729Extensions?

For example, if you want to have VAD operation (Annex B) with G.729A and is also capable say of 6.4 kb/s operation (Annex D). Then you would set the flags for A, B, and D. Another example, if you have an implementation with G.729A and G.729D (6.4 kb/s), then you would have the flags for Annexes A and D set.

In my understanding, g729AnnexA, g729wAnnexB and g729AnnexAwAnnexB, for which g729AnnexA, g729AnnexB and g729AnnexAwAnnexB should be used only if the additional modes are not used (Annex D and E and the different combinations with G.729 Main body, Annex A, and Annex B). It was actually a short-sightedness on our part when the codepoints were first defined.

I hope this helps, Simao