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<TITLE>RE: G.729 in H.245v7</TITLE>
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<P><FONT SIZE=2>OK Thanks.</FONT>
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<P><FONT SIZE=2>Pretty messy... But I guess it is the price of backward compatibility.</FONT>
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<P><FONT SIZE=2>> -----Original Message-----</FONT>
<BR><FONT SIZE=2>> From: Simao Campos [<A HREF="mailto:simao.campos@labs.comsat.com">mailto:simao.campos@labs.comsat.com</A>]</FONT>
<BR><FONT SIZE=2>> Sent: Friday, December 01, 2000 11:00 AM</FONT>
<BR><FONT SIZE=2>> To: Audet, Francois [SC2:4K02:EXCH]</FONT>
<BR><FONT SIZE=2>> Cc: ITU-SG16@mailbag.cps.intel.com</FONT>
<BR><FONT SIZE=2>> Subject: G.729 in H.245v7</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> Francois</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> > So my question is: when are the Annex A and Annex B flag used in</FONT>
<BR><FONT SIZE=2>> > g729Extensions?</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> For example, if you want to have VAD operation (Annex B) with G.729A</FONT>
<BR><FONT SIZE=2>> and is also capable say of 6.4 kb/s operation (Annex D). Then you</FONT>
<BR><FONT SIZE=2>> would set the flags for A, B, and D. Another example, if you have an</FONT>
<BR><FONT SIZE=2>> implementation with G.729A and G.729D (6.4 kb/s), then you would have</FONT>
<BR><FONT SIZE=2>> the flags for Annexes A and D set.</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> In my understanding, g729AnnexA, g729wAnnexB and g729AnnexAwAnnexB,</FONT>
<BR><FONT SIZE=2>> for which g729AnnexA, g729AnnexB and g729AnnexAwAnnexB should be used</FONT>
<BR><FONT SIZE=2>> only if the additional modes are not used (Annex D and E and the</FONT>
<BR><FONT SIZE=2>> different combinations with G.729 Main body, Annex A, and </FONT>
<BR><FONT SIZE=2>> Annex B). It </FONT>
<BR><FONT SIZE=2>> was actually a short-sightedness on our part when the codepoints were</FONT>
<BR><FONT SIZE=2>> first defined.</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> I hope this helps,</FONT>
<BR><FONT SIZE=2>> Simao</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> </FONT>
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