[asterisk-dev] [Code Review] Revert contantssrc change in favor of a more focused fix

[Mark Michelson]

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>From a code standpoint I have no complaints. I really can't give a "Ship It!" until this has been tested though.

- Mark


On 2010-03-03 22:36:35, Terry Wilson wrote:
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> https://reviewboard.asterisk.org/r/540/
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> (Updated 2010-03-03 22:36:35)
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> Review request for Asterisk Developers and Russell Bryant.
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> Summary
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> This change basically reverts the change reviewed in https://reviewboard.asterisk.org/r/374/ and instead limits the updating of the RTP synchronization source to only those times when we detect that the other side of the conversation has changed the ssrc.
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> The problem is that SRCUPDATE control frames are sent many times where we don't want a new ssrc, including whenever Asterisk has to send DTMF in a normal bridge. This is also not the first time that this mistake has been made. The initial implementation of the ast_rtp_new_source function also changed the ssrc--and then it was removed because of this same issue. Then, we put it back in again to fix a different issue. Instead, I think we should make a very limited change and just update the ssrc when we see it change.
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> This issue affects mantis issues 5413 (srtp doesn't like the ssrc changing), 15642 (sonus dtmf), 16292 (Exchange UM dtmf), and probably 16438 and 16714.
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> Diffs
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>   /trunk/include/asterisk/rtp_engine.h 244504 
>   /trunk/res/res_rtp_asterisk.c 244504 
>   /trunk/channels/chan_sip.c 244504 
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> Diff: https://reviewboard.asterisk.org/r/540/diff
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> Testing
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> So far...it compiles. I'm trying to devise a simple way to replicate the original issue which was a reinvite sent to asterisk which results in an ssrc change in the rtp sent to asterisk.
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> Thanks,
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> Terry
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>