[asterisk-dev] [IAX] Sending VNAK for out of order fr->iseqno

[Yousf Ateya]

When peer recieves fr->oseqno other than the expected one, it sends VNAK.

if ((iaxs[fr->callno]->iseqno != fr->oseqno) &&

but it don't do the same for fr->iseqno. When a peer receives a frame, it
uses fr->iseqno without any checking. Here is a sample received packets:

[2015-03-12 13:26:03.071] VERBOSE[6960] chan_iax2.c: Rx-Frame Retry[
No] -- OSeqno: 008 ISeqno: 007 Type: IAX     Subclass: ACK
[2015-03-12 13:26:03.071] VERBOSE[6960] chan_iax2.c:    Timestamp:
19717ms  SCall: 07431  DCall: 25289 45.56.114.174:4566


[2015-03-12 13:26:03.099] VERBOSE[6960] chan_iax2.c: Rx-Frame Retry[
No] -- OSeqno: 008 ISeqno: 006 Type: IAX     Subclass: LAGRP
[2015-03-12 13:26:03.099] VERBOSE[6960] chan_iax2.c:    Timestamp:
20007ms  SCall: 07431  DCall: 25289 45.56.114.174:4566

Here, peer received iseqno 7 before 6.

More details in this comment:
https://issues.asterisk.org/jira/browse/ASTERISK-24873?focusedCommentId=225569&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-225569

Is is better that the peer sends VNAK when it receives out-of-order
fr->inseqno?
-- 
Yousf Ateya,

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