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Can you elaborate on what actually happens here between 11<->12 and 12<->12 
that makes it so we need to remove the newly added ones? 

- Joshua Colp


On Aug. 4, 2014, 10:47 p.m., rmudgett wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> https://reviewboard.asterisk.org/r/3889/
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> 
> (Updated Aug. 4, 2014, 10:47 p.m.)
> 
> 
> Review request for Asterisk Developers.
> 
> 
> Repository: Asterisk
> 
> 
> Description
> -------
> 
> The format compatibility bits need to remain frozen to new codecs.  
> Otherwise, older channel drivers like chan_iax2 could attempt to negotiate 
> them when they have no support for negotiating any of the format's other 
> potential parameters.  In addition, the chan_iax2 format preference order 
> values sent over the wire have no defined fixed value to represent Opus and 
> VP8.
> 
> 
> Diffs
> -----
> 
>   /branches/12/main/format.c 420025 
> 
> Diff: https://reviewboard.asterisk.org/r/3889/diff/
> 
> 
> Testing
> -------
> 
> Compiles and code inspeciton.
> 
> See format.c:format_list_init() and format_pref.c:ast_codec_pref_convert().
> The format_list container is used to generate the format_list_array which is 
> then is used by chan_iax2 to determine the format index sent over the wire in 
> IAX_IE_CODEC_PREFS.
> 
> 
> Thanks,
> 
> rmudgett
> 
>

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