Merged revisions 46082-46083,46152-46153 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

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r46082 | kpfleming | 2006-10-23 22:45:42 -0500 (Mon, 23 Oct 2006) | 2 lines

add an API call to allow channel drivers to determine which media formats are compatible (passthrough or transcode) with the format an existing channel is already using

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r46083 | kpfleming | 2006-10-23 22:53:32 -0500 (Mon, 23 Oct 2006) | 2 lines

ensure that the translation matrix is properly lock-protected every place it is used

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r46152 | kpfleming | 2006-10-24 18:45:19 -0500 (Tue, 24 Oct 2006) | 2 lines

if multiple translators are registered for the same source/dest combination, ensure that the lowest-cost one is always inserted earlier in the list

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r46153 | kpfleming | 2006-10-24 19:10:54 -0500 (Tue, 24 Oct 2006) | 2 lines

code zone experiment: don't offer formats in the outbound INVITE that aren't either passthrough or translatable

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@46203 65c4cc65-6c06-0410-ace0-fbb531ad65f3