[SR-Users] bogus event with terminated dialogs with late 200ok responses

[David Escartín]

Hello all

using kamailio version 5.4.4, we are seeing some errors like

CRITICAL: dialog [dlg_hash.c:1205]: next_state_dlg(): bogus event 3 in
state 5 (with BYE) for dlg 0x7f6ca2304b48 [15135:39671] with clid
'00463385_20210512_002_HPRA_1.1.4.40.sp3_7532_0_54533900281' and tags
'Out-55089-0000000CB27947F9' '170cB11c48vmj'

which seem to be generated when we receive a BYE from the remote UA but we
were expecting an ACK also,

For example
INVITE ---------->
<---------------183
<---------------200
BYE ------------->
(no ACK)
<--------------200
<--------------200
....

so the b2bua (freeswitch) keeps retransmitting the 200ok, and on each 200ok
retransmission we are getting this type of message.
These seem to be like race conditions since 200/BYE flow almost at the same
time, and as I understand, the UA should send the ACK.
But my doubt is if these errors can be harmful for the kamailio or they can
be ignored and address the issue to the remote UA on each case

thanks a lot and regards
david

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<http://www.sonoc.io/>
David Escartín
NOC engineer
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