[asterisk-dev] [Code Review] 3657: when using FEC, asterisk considers negative sequence numbers as missing

[Torrey Searle]

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(Updated June 26, 2014, 7:21 a.m.)


Status
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This change has been marked as submitted.


Review request for Asterisk Developers.


Changes
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Committed in revision 417318


Bugs: ASTERISK-23908
    https://issues.asterisk.org/jira/browse/ASTERISK-23908


Repository: Asterisk


Description
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When using FEC error correction with span=3 and entries=4 asterisk will try to repair in packet with sequence number 5 because it will see that packet -4 is missing. The result is that Asterisk will forward garbage packets that can possibly kill the fax.

This patch adds a check to see if the sequence number is valid before checking if the packet is missing


Diffs
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  trunk/main/udptl.c 416335 

Diff: https://reviewboard.asterisk.org/r/3657/diff/


Testing
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Replayed the T.38 FEC callflow using a version of SIPP patched to understand m=image for pcapplay


Thanks,

Torrey Searle

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