[asterisk-dev] [Code Review] 3700: sip.conf progressinband=never should mean 'never'

[rmudgett]

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Please put the ASTERISK issue in the bugs field so people can know what issue this patch fixes.

- rmudgett


On July 2, 2014, 4:34 a.m., one47 wrote:
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> https://reviewboard.asterisk.org/r/3700/
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> (Updated July 2, 2014, 4:34 a.m.)
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> 
> Review request for Asterisk Developers.
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> Repository: Asterisk
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> Description
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> progressinband=never in sip.conf is easily defeated if an onward trunk sends a progress indication of its own. This is almost certain to happen if the onward trunk is ISDN or IAX as these technologies send a progress indication even if early media is not required. This progress message is passed to the caller, and causes the "never" option to be rather badly named.
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> Proposed solution, applied in this patch:
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> 1) In sip_write(), do not pass the media unless we have either progressed beyond INV_EARLY_MEDIA, or we are in INV_EARLY_MEDIA state, and early media is both set-up and wanted. This helps resolve double-ringing on some buggy handsets.
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> 2) In sip_indicate(), if we see AST_CONTROL_PROGRESS, but SIP_PROG_INBAND_NEVER is set, send a 180 Ringing instead to avoid implicitly enabling early media. Avoid sending double ring indications.
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> NOTE: the meaning of the SIP_PROGRESS_SENT flag changes slightly in this patch to also encapsulate the fact that a channel has *sent or received* a 183 Progress indication. This makes the updated code in sip_write() much more simple.
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> NOTE2: Not sure this change is safe for Asterisk 11 as it may cause an unexpected change of behaviour for some users.
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> Diffs
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>   /trunk/channels/chan_sip.c 417704 
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> Diff: https://reviewboard.asterisk.org/r/3700/diff/
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> Testing
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> The change to sip_write() and SIP_PROGRESS_SENT has been tested on a couple of hundred live servers running 1.6.2, 1.8.2x and 11.10 - No obvious issues, and correctly resolves some double ringing and no-ringing issues with Polycom and Yealink handsets.
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> The change to sip_indicate() tested with progressinband=never and progressinband=no with both SIP and Websockets endpoints. Intended behaviour observed.
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> Thanks,
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> one47
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>

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