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

[Terry Wilson]

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https://reviewboard.asterisk.org/r/1195/
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Review request for Asterisk Developers, Mark Michelson and David Vossel.


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.

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.

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.


Diffs
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  /branches/1.4/res/res_features.c 314725 

Diff: https://reviewboard.asterisk.org/r/1195/diff


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.


Thanks,

Terry

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