Summary:ASTERISK-16736: SIP session timers do not transmit session expiry or refresher timer in 200 OK
Reporter:Jimmy le Grange (legranjl)Labels:
Date Opened:2010-09-27 00:34:43Date Closed:2011-07-27 13:56:51
Versions:Frequency of
Environment:Attachments:( 0) timer_sipdebug.log
( 1) timer_wireshark.cap
Description:When acting as uac the 200ok replay to uas does not include the sessoin expiry and refresher timer. This turns the timer off.

RFC4028, chapter 7.2:
  "If the 2xx response did not contain a Session-Expires header field,
  there is no session expiration.  In this case, no refreshes need to
  be sent.  A 2xx without a Session-Expires can come for both initial
  and subsequent session refresh requests.  This means that the session
  timer can be 'turned-off' in mid dialog by receiving a response
  without a Session-Expires header field.


Config as follow:

Values are low for testing

Comments:By: Leif Madsen (lmadsen) 2010-09-28 10:51:49

I think it would be useful to have some logging of this happening between Asterisk and the client showing it clearly. Please provide SIP debug traces along with SIP history as enabled in sip.conf.

You can log this to a separate file using logger.conf and then attach the resulting log to this issue. Thanks!

By: Jimmy le Grange (legranjl) 2010-10-05 04:11:03


Attached I have the requested info.

For Clarity
Endpoint to Asterisk to Intrerconnect customer

The timer between endpoint and Asterisk are working fine execpt that it is still incorrect. Below is my evaluation

In packet 6 the Interconnect side receives INVITE message from Asterisk side with Session-Expires headers.

In packet 11 the Interconnect side answers with 200OK with "Session-Expires: 95;refresher=uas", means interconnect side is (UAS) will refresh the session after 95/2=47,5 seconds.

At packet 19 (47.5 sec. later) Interconnect side is sending reINVITE for session refresh with"Session-Expires: 95;refresher=uac", means Interconnect side (now UAC) will refresh the session.

At packet 21 the asterisk side answers with 200OK without any Session-Expires field.

This effectively means terminate timer. The correct responce should be to coppy the Session-Expires: 95;refresher=uac" header in the reINVITE and add it in the 200ok response.

By: Russell Bryant (russell) 2011-07-27 13:56:46.733-0500

Per the Asterisk maintenance timeline page at http://www.asterisk.org/asterisk-versions maintenance (bug) support for the 1.4 and 1.6.x branches has ended. For continued maintenance support please move to the 1.8 branch which is a long term support (LTS) branch. For more information about branch support, please see https://wiki.asterisk.org/wiki/display/AST/Asterisk+Versions

If this is still an issue, please open a new issue so it can be re-triaged appropriately. Thanks!