[sr-dev] [ openser-Bugs-2819457 ] dialog module. BYE with bad Cseq.

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Bugs item #2819457, was opened at 2009-07-10 10:47
Message generated for change (Comment added) made by baron76
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Category: modules
Group: ver 1.5.x
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Alexandr Dubovikov (baron76)
Assigned to: Nobody/Anonymous (nobody)
Summary: dialog module. BYE with bad Cseq.

Initial Comment:
the dialog module in timeout BYE request send thru tm_module Cseq number from INVITE.

dlg_req_within.c:
function:
 dlg_t * build_dlg_t(struct dlg_cell * cell, int dir){
line:
td->loc_seq.value = loc_seq;

if before final 200 OK, we will recieve PRACK/200 (new Cseq) , the dialog module will send bad Cseq number (loc_seq + 1);

Scenario:
----INVITE ( Cseq: 1)  -> 
<--- 183 ( Cseq: 1)  ----
---- PRACK ( Cseq: 3)  -> 
<---- 200 OK ( Cseq: 3)  -
---------- timeout ---->
---- BYE ( Cseq: 2)  -> 
<------ 503 (Bad CSeq number) -------

Quickly Solution:
td->loc_seq.value = loc_seq + 100;



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>Comment By: Alexandr Dubovikov (baron76)
Date: 2009-07-10 13:55

Message:
Hi miconda, 

much better remove_hf("Supported:") from INVITE request; :-)
and PRACK/200 ok in the dialog. But I think, the best solution, set
loc_seq +100.

P.S. don't forget about UPDATE method.


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Comment By: Daniel-Constantin Mierla (miconda)
Date: 2009-07-10 13:48

Message:
quick fix: reply pracks on server, with sl_send_reply() as they just get
into config?!?!

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Comment By: Iñaki Baz Castillo (ibc_sf)
Date: 2009-07-10 12:59

Message:
This is a good example of why a proxy shouldn't try to behave as a B2BUA
XD

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Comment By: Alexandr Dubovikov (baron76)
Date: 2009-07-10 10:50

Message:
oops:
Scenario:
----INVITE ( Cseq: 1) ->
<--- 183 ( Cseq: 1) ----
---- PRACK ( Cseq: 3) ->
<---- 200 OK ( Cseq: 3 PRACK) -
<---- 200 OK ( Cseq: 1 INVITE) -
---------- timeout dialog ---->
---- BYE ( Cseq: 2) ->
<------ 503 (Bad CSeq number) -------

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=743020&aid=2819457&group_id=139143