[SR-Users] Strange PUA Behaviour

Daniel-Constantin Mierla miconda at gmail.com
Tue Jan 26 22:08:17 CET 2016



On 26/01/16 12:54, Phil Lavin wrote:
>
> Sorry, correction – desired expires is always 1 second LESS than expires.
>

Is this above happening when taking it from the dialog module value?

Cheers,
Daniel
>
>  
>
>  
>
> Phil
>
>  
>
> *From:*Phil Lavin
> *Sent:* 26 January 2016 11:54
> *To:* 'miconda at gmail.com' <miconda at gmail.com>; Kamailio (SER) - Users
> Mailing List <sr-users at lists.sip-router.org>
> *Cc:* Telco Team <telco-team at 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 at gmail.com]
> *Sent:* 26 January 2016 11:36
> *To:* Phil Lavin <phil.lavin at synety.com
> <mailto:phil.lavin at synety.com>>; Kamailio (SER) - Users Mailing List
> <sr-users at lists.sip-router.org <mailto:sr-users at lists.sip-router.org>>
> *Cc:* Telco Team <telco-team at synety.com <mailto:telco-team at 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 at gmail.com <mailto:miconda at gmail.com>; Kamailio (SER)
>     - Users Mailing List <sr-users at lists.sip-router.org>
>     <mailto:sr-users at lists.sip-router.org>
>     *Cc:* Telco Team <telco-team at synety.com>
>     <mailto:telco-team at synety.com>
>     *Subject:* RE: [SR-Users] Strange PUA Behaviour
>
>      
>
>     Hi Daniel,
>
>      
>
>     Any thoughts on this?
>
>      
>
>      
>
>     Thanks
>
>      
>
>     Phil Lavin
>
>     Telecoms Systems Manager
>
>     *CloudCall by SYNETY*
>     www.cloudcall.com <http://www.cloudcall.com/>
>
>     *
>     *T: +44 (0) 330 335 0000 / +1 617 982 1600
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>
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>      
>
>     *From:*Phil Lavin
>     *Sent:* 20 January 2016 19:52
>     *To:* miconda at gmail.com <mailto:miconda at gmail.com>; Kamailio (SER)
>     - Users Mailing List <sr-users at lists.sip-router.org
>     <mailto:sr-users at lists.sip-router.org>>
>     *Cc:* Telco Team <telco-team at synety.com
>     <mailto:telco-team at 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 at gmail.com]
>     *Sent:* 19 January 2016 23:26
>     *To:* Phil Lavin <phil.lavin at synety.com
>     <mailto:phil.lavin at synety.com>>; Kamailio (SER) - Users Mailing
>     List <sr-users at lists.sip-router.org
>     <mailto:sr-users at 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.notifier_processes
>
>     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 at lists.sip-router.org]
>         *On Behalf Of *Phil Lavin
>         *Sent:* 19 January 2016 18:11
>         *To:* miconda at gmail.com <mailto:miconda at gmail.com>; Kamailio
>         (SER) - Users Mailing List <sr-users at lists.sip-router.org>
>         <mailto:sr-users at 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://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

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