26 Jan
2016
26 Jan
'16
1:54 p.m.
Sorry, correction - desired expires is always 1 second LESS than expires.
Phil
From: Phil Lavin
Sent: 26 January 2016 11:54
To: 'miconda(a)gmail.com' <miconda(a)gmail.com>om>; Kamailio (SER) - Users Mailing
List <sr-users(a)lists.sip-router.org>
Cc: Telco Team <telco-team(a)synety.com>
Subject: RE: [SR-Users] Strange PUA Behaviour
Hi Daniel,
Not setting the lifetime does indeed take the expiry from the dialog but the mechanism
that refreshes the expiry when the call is ongoing does not run unless max_expires time is
less than the lifetime. This seems to be because of the below code in pua.c:
if((p->desired_expires> p->expires + min_expires) ||
(p->desired_expires== 0 ))
The desired_expires value is always 1 second greater than the expires value unless you set
max_expires to pull it down. This has the side effect that the presentity entries are
cleaned up prematurely, however.
Setting lifetime to a high value negates the need for the refreshes to happen.
Cheers
Phil
From: Daniel-Constantin Mierla [mailto:miconda@gmail.com]
Sent: 26 January 2016 11:36
To: Phil Lavin <phil.lavin@synety.com<mailto:phil.lavin@synety.com>>; Kamailio
(SER) - Users Mailing List
<sr-users@lists.sip-router.org<mailto:sr-users@lists.sip-router.org>>
Cc: Telco Team <telco-team@synety.com<mailto:telco-team@synety.com>>
Subject: Re: [SR-Users] Strange PUA Behaviour
Hello,
thanks to tackling this further ... see my comments inline...
On 26/01/16 11:46, Phil Lavin wrote:
We now have something of a resolution to this. Config is below. The key differences are:
* pua - db_mode set to 0. This stops multiple states for a single dialog (early,
trying, confirmed and terminated) from showing in the presentity table. I suspect this is
a bug?
OK -- still in my todo to pursue this case.
* pua_dialoginfo - override_lifetime set to a value > 4 hours. 4 hours chosen
because our platform terminates calls after 4 hours to stop incomplete calls from
continuing forever. There does seem to be a mechanism to refresh the expiry time of
presentity records but it is only called when the max_expires time is less than the
override_lifetime. Doing that causes records to be prematurely cleaned up. I suspect a few
different bugs here?
IIRC, if you don't set:
modparam("pua_dialoginfo", "override_lifetime", 14420)
The value is taken from max dialog duration. Can you try without this parameter? The
parameter should be used only if you want to overwrite the dialog module value.
Cheers,
Daniel
# ----- presence params -----
modparam("presence", "db_url", DBURL)
modparam("presence", "send_fast_notify", 0)
modparam("presence", "db_update_period", 20)
modparam("presence", "clean_period", 60)
modparam("presence", "max_expires", 14430)
# ----- presence_xml params -----
modparam("presence_xml", "db_url", DBURL)
modparam("presence_xml", "force_active", 1)
# ----- presence_dialoginfo -----
modparam("presence_dialoginfo", "force_single_dialog", 0)
modparam("presence_dialoginfo", "force_dummy_dialog", 1)
# ----- pua params -----
modparam("pua", "db_url", DBURL)
modparam("pua", "db_mode", 0)
modparam("pua", "update_period", 20)
modparam("pua", "dlginfo_increase_version", 0)
modparam("pua", "reginfo_increase_version", 0)
# ----- pua_dialoginfo params -----
modparam("pua_dialoginfo", "send_publish_flag", FLT_DLGINFO)
modparam("pua_dialoginfo", "override_lifetime", 14420)
modparam("pua_dialoginfo", "include_callid", 1)
modparam("pua_dialoginfo", "caller_confirmed", 0)
modparam("pua_dialoginfo", "include_tags", 1)
Phil
From: Phil Lavin
Sent: 22 January 2016 13:19
To: miconda@gmail.com<mailto:miconda@gmail.com>; Kamailio (SER) - Users Mailing List
<sr-users@lists.sip-router.org><mailto:sr-users@lists.sip-router.org>
Cc: Telco Team <telco-team@synety.com><mailto:telco-team@synety.com>
Subject: RE: [SR-Users] Strange PUA Behaviour
Hi Daniel,
Any thoughts on this?
Thanks
Phil Lavin
Telecoms Systems Manager
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From: Phil Lavin
Sent: 20 January 2016 19:52
To: miconda@gmail.com<mailto:miconda@gmail.com>; Kamailio (SER) - Users Mailing List
<sr-users@lists.sip-router.org<mailto:sr-users@lists.sip-router.org>>
Cc: Telco Team <telco-team@synety.com<mailto:telco-team@synety.com>>
Subject: RE: [SR-Users] Strange PUA Behaviour
Hi Daniel,
Sorry for the delay in replying. I've attached blf.cap which shows the "light
stays on" scenario. You'll see that the final NOTIFY (packet 43) is a
"confirmed" rather than a "terminated" as per the PUBLISH (packet 41)
that triggered it.
I've also attached presentity.txt which is the contents of the DB before the pcap was
taken.
With regards to your question about the light going out after the entries in the table
have expired, this does happen automatically. As soon as the table drops down to being
empty (it takes a couple of minutes to fully clear), the light goes off. Subsequent calls
will work correctly with BLF until it eventually stops working and the whole cycle
repeats.
I have repeated the test with subs_db_mode 0 and the same results occur. This is, in fact,
the state it was in when the attached pcap was taken.
Do you think the problem is in the cleanup of the data or in the way the active dialog is
matched against the set of data in the table? Happy to prod through the code with gdb if
you can point me in the direction of where to start looking.
Cheers
Phil
From: Daniel-Constantin Mierla [mailto:miconda@gmail.com]
Sent: 19 January 2016 23:26
To: Phil Lavin <phil.lavin@synety.com<mailto:phil.lavin@synety.com>>; Kamailio
(SER) - Users Mailing List
<sr-users@lists.sip-router.org<mailto:sr-users@lists.sip-router.org>>
Subject: Re: [SR-Users] Strange PUA Behaviour
Can you get a pcap for a case with the new config? Being traveling, but maybe I get a
chance to look at it soon.
Reading quickly on some docs, I noticed that subs_db_mode=3 and notifier_proceses=0 rise a
conflict:
http://www.kamailio.org/docs/modules/devel/modules/presence.html#presence.p…
Can you try with subs_db_mode=0 and see if works different?
Cheers,
Daniel
On 19/01/16 20:35, Phil Lavin wrote:
Just to follow this up with more recent results. I've simplified things and have been
testing calling from a Kamailio registered UA to a phone on the PSTN. There's only 1
dialog in Kamailio for this and the results are just as strange. BLF works for a while and
then breaks. In this particular case, the light does not go off after the call.
I have set subs_db_mode to 3 (new config below) and I can consistently reproduce the BLF
light not turning off after the call has ended (the phone does not get sent a terminate).
As soon as I truncate pua and presentity tables in the DB, the next call works fine.
modparam("presence", "subs_db_mode", 3)
modparam("presence", "notifier_processes", 0)
modparam("presence", "db_url", DBURL)
modparam("presence", "send_fast_notify", 0)
modparam("presence", "db_update_period", 20)
modparam("presence_xml", "db_url", DBURL)
modparam("presence_xml", "force_active", 1)
modparam("presence_dialoginfo", "force_single_dialog", 1)
modparam("presence_dialoginfo", "force_dummy_dialog", 1)
modparam("pua", "db_url", DBURL)
modparam("pua", "db_mode", 2)
modparam("pua", "update_period", 20)
modparam("pua_dialoginfo", "send_publish_flag", FLT_DLGINFO)
modparam("pua_dialoginfo", "override_lifetime", 124)
Before I truncate, the tables both a good number of rows in each (70ish).
Is it that they're not being correctly cleaned up here?
Thanks
Phil
From: sr-users [mailto:sr-users-bounces@lists.sip-router.org] On Behalf Of Phil Lavin
Sent: 19 January 2016 18:11
To: miconda@gmail.com<mailto:miconda@gmail.com>; Kamailio (SER) - Users Mailing List
<sr-users@lists.sip-router.org><mailto:sr-users@lists.sip-router.org>
Subject: Re: [SR-Users] Strange PUA Behaviour
Below is the relevant presence/pua stuff. Let me know if I should be examining other
tables.
When the call ends, there are no dialogs remaining in the dialog table. A few things do
hang around in the presentity and pua tables for a short period of time.
Regarding CLI changing, it does seem to do so. When the call is routed onto the billing
platform, the CLI is changed to the local "extension" (e.g. 9989) on the leg
that comes back to Kamailio, destined for the callee.
Regarding only advertising the leg going to the callee, not all calls will terminate on a
UA registered against Kamailio (e.g. calls from a Kamailio registered UA to the PSTN). The
more I think about it, determining the correct leg in all scenarios will be difficult.
--
Daniel-Constantin Mierla
http://twitter.com/#!/miconda<http://twitter.com/#%21/miconda> -
http://www.linkedin.com/in/miconda
Book: SIP Routing With Kamailio - http://www.asipto.com
http://miconda.eu
--
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Book: SIP Routing With Kamailio - http://www.asipto.com
http://miconda.eu