[asterisk-dev] [Code Review] Fix up indications issues related to redirects

[Russell Bryant]

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http://reviewboard.digium.com/r/90/
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Review request for Asterisk Developers.


Summary
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This patch was written to resolve issue #13747.

The issue that was reported was about a case where a RINGING channel got redirected to an extension to pick up a call from parking.  Once the parked call got taken out of parking, it heard silence until the other side answered.  Ideally, the caller that was parked would get a ringing indication.  This patch fixes this case so that the caller receives ringback once it comes out of parking until the other side answers.

The fixes are:

1) Make sure we remember that a channel was an outgoing channel when doing a masquerade.  This prevents an erroneous ast_answer() call on the channel, which causes a bogus 200 OK to be sent in the case of SIP.

2) Add some additional comments to explain related parts of code.

3) Update the handling of the ast_channel visible_indication field.  Storing values that are not stateful is pointless.  Control frames that are events or commands should be ignored.

4) When a bridge first starts, check to see if the peer channel needs to be given ringing indication because the calling side is still ringing.


This addresses bug 13747.
    http://bugs.digium.com/view.php?id=13747


Diffs
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  /branches/1.4/main/channel.c 163760 
  /branches/1.4/res/res_features.c 163760 

Diff: http://reviewboard.digium.com/r/90/diff


Testing
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1) SIP/5001 calls SIP/5004
2) SIP/5001 transfers SIP/5004 to parking

(5004 is now parked, 5001 idle)

3) Originate an outbount call to SIP/5001.
4) Redirect the ringing channel to the proper extension to pick up the parked call.

Verified that after #4, 5001 was still ringing, and that 5004 received ringback.

5) Answer SIP/5001

Verified that the callers could now talk as usual


Thanks,

Russell