[asterisk-dev] [Code Review] 3174: chan_iax2: Block unnecessary control frames to/from the wire.

[Matt Jordan]

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Ship it!


Ship It!

- Matt Jordan


On Feb. 5, 2014, 6:13 p.m., rmudgett wrote:
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> https://reviewboard.asterisk.org/r/3174/
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> (Updated Feb. 5, 2014, 6:13 p.m.)
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> 
> Review request for Asterisk Developers.
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> Bugs: AST-1302
>     https://issues.asterisk.org/jira/browse/AST-1302
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> Repository: Asterisk
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> Description
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> Establishing an IAX2 call between Asterisk v1.4 and v1.8 (or later) results in an unexpected call disconnect.  The problem happens because newer values in the enum ast_control_frame_type are not consistent between the branch versions of Asterisk.
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> For example:
> 1) v1.4 calls v1.8 (or later) using IAX2
> 2) v1.8 answers and sends a connected line update control frame. (on v1.8 AST_CONTROL_CONNECTED_LINE = 22)
> 3) v1.4 receives the control frame as an end-of-q (on v1.4 AST_CONTROL_END_OF_Q = 22)
> 4) v1.4 disconnects the call once the receive queue becomes empty.
> 
> Several things are done by this patch to fix the problem and attempt to prevent it from happening again in the future:
> * Added a warning at the definition of enum ast_control_frame_type about how to add new control frame values.
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> * Made block sending and receiving control frames that have no reason to go over the wire.
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> * Extended the connectedline iax.conf parameter to also include the redirecting information updates.
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> * Updated the connectedline iax.conf parameter documentation to include a notice that the parameter must be "no" when the peer is an Asterisk v1.4 instance.
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> 
> Diffs
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>   /branches/1.8/include/asterisk/frame.h 407562 
>   /branches/1.8/configs/iax.conf.sample 407562 
>   /branches/1.8/channels/chan_iax2.c 407562 
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> Diff: https://reviewboard.asterisk.org/r/3174/diff/
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> Testing
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> Without the patch the IAX2 call gets disconnected when the call initially connects.
> With the patch the call stays up.
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> 
> Thanks,
> 
> rmudgett
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>

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