[asterisk-dev] [Code Review] Allow transfer loops w/o allowing forwarding loops

[Mark Michelson]

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Ship it!


- Mark


On 2011-04-22 18:12:01, Terry Wilson wrote:
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> (Updated 2011-04-22 18:12:01)
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> Review request for Asterisk Developers, Mark Michelson and David Vossel.
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> Summary
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> We try to avoid the situation where two phones may be forwarded to each other causing an infinite loop by storing each dialed interface in a channel datastore and checking the list before dialing out. This works, but currently breaks situations like A calls B, A transfers B to C, B transfers C to A, and A transfers C to B. Since human interaction is happening here and not an automated forwarding loop, it should be allowed.
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> This patch removes the dialed_interfaces datastore when a call is bridged (a suggestion from the brilliant mmichelson). If a call is being bridged, it should be safe to assume that we aren't stuck in a loop.
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> I determined that it was "peer" and not "chan" where the datastore was stored by trial and error. No matter what I tried, "chan" never had the datastore. I will fully admit that the features code still confuses the hell out of me even after all of these years.
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> Note: This bug exists also up to 1.8 (probably trunk, I just haven't tried yet)
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> Diffs
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>   /branches/1.4/apps/app_dial.c 314725 
>   /branches/1.4/apps/app_queue.c 314725 
>   /branches/1.4/res/res_features.c 314725 
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> Diff: https://reviewboard.asterisk.org/r/1195/diff
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> Testing
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> I tried the above scenario and it now works. I also tried forwarding a couple of phones to each other and it still broke out of the loop.
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> Thanks,
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> Terry
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