[asterisk-dev] [Code Review] 2841: chan_sip: Don't allow T38 error correction offered by remote peer when error correction mode is explicitly set to 'none'

[jrose]

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https://reviewboard.asterisk.org/r/2841/
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(Updated Sept. 10, 2013, 10:10 p.m.)


Review request for Asterisk Developers, Joshua Colp and Mark Michelson.


Bugs: ASTERISK-21150
    https://issues.asterisk.org/jira/browse/ASTERISK-21150


Repository: Asterisk


Description (updated)
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By default, if t38 is enabled then the error correction mode will be set to FEC. Optionally, if t38pt_udptl is set to 'yes,none', then it will be set to use no error correction. However, currently if Asterisk receives an invite with error correction in it for a peer with error correction disabled, it will include the offered error correction in outgoing invites.

This patch was written and tested by Nitesh Bansal. It adds some error correction mode checking while processing the SDP and if an image header is detected in SDP for a peer that hasn't enabled T38 yet with an error correction scheme of none, then the error correction scheme will explicitly be set to none for the SIP private's UDPTL session.


Diffs
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  /branches/1.8/channels/chan_sip.c 398636 

Diff: https://reviewboard.asterisk.org/r/2841/diff/


Testing
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Made sure the patch doesn't negatively impact fax tests (when applied to Asterisk 11)


Thanks,

jrose

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