[SR-Users] IMS: maybe a bug in S-CSCF: should we create an issue?
Carsten Bock
carsten at ng-voice.com
Mon Feb 19 14:39:30 CET 2018
Hi,
the challenge is, that Kamailio's S-CSCF-Usrloc does not support
DB-Realtime like the "usual" usrloc module does. The database is
always just a backup in order to survive a restart and will never be
accessed, when an entry is not found in memory (PR are welcome).
The Bug i see here, is that it's not clearly stated in the docs... ;-)
Thanks,
Carsten
2018-02-19 13:56 GMT+01:00 Valentin Christoph <Christoph.Valentin at kapsch.net>:
> Hi all,
>
>
>
> We are using kamailio 5.1.0 as S-CSCF as follows:
>
>
>
> We have two machines and two kamailio instances, one on each machine, both
> working on the same database (together they build one highly available
> S-CSCF).
>
>
>
> After registering a user via the first kamailio instance, then the first
> instance is stopped (simulating an outage), and the HSS sends an RTR to the
> second instance.
>
>
>
> However, the second instance does not find the registered user in its cache
> and it does not access the database --> the deregistration fails.
>
>
>
> Configuration:
>
> kamailio-scscf/kamailio-scscf-modules.cfg:modparam("ims_usrloc_scscf",
> "enable_debug_file", 0)
>
> kamailio-scscf/kamailio-scscf-modules.cfg:modparam("ims_usrloc_scscf",
> "matching_mode", 0)
>
> kamailio-scscf/kamailio-scscf-modules.cfg:modparam("ims_usrloc_scscf",
> "db_url", DB_URL)
>
> kamailio-scscf/kamailio-scscf-modules.cfg:modparam("ims_usrloc_scscf",
> "db_mode", 2)
>
> kamailio-scscf/kamailio-scscf-modules.cfg:modparam("ims_usrloc_scscf",
> "timer_interval", 10)
>
> kamailio-scscf/kamailio-scscf-modules.cfg:modparam("ims_usrloc_scscf",
> "timer_procs", 4)
>
>
>
> Does anyone immediately “see” a mis-configuration, or should we create an
> issue?
>
>
>
> Details in the mail below.
>
>
>
> Thanks,
>
> Christoph
>
>
>
>
>
> From: Friedrich Peter
> Sent: Friday, February 16, 2018 6:38 PM
> To: Valentin Christoph <Christoph.Valentin at kapsch.net>
> Cc: Onic Roman <Roman.Onic at kapsch.net>; Habashizadeh Mahmoud
> <Mahmoud.Habashizadeh at kapsch.net>
> Subject: AW: Kein RTR Message nachdem SCSCF-1 outage
>
>
>
> Hello,
>
>
>
> following scenario at REGISTER of catt subscriber: start with empty db and
> empty usrloc cache
>
>
>
> node1(.23):
>
> MariaDB [scscf]> select * from impu;
>
> Empty set (0.00 sec)
>
>
>
> [root at vict-ims ~]# kamctl kamcmd ulscscf.showimpu sip:catt178 at vict-ims.net
>
> [root at vict-ims ~]#
>
>
>
>
>
> [root at vict-ims2 etc]# kamctl kamcmd ulscscf.showimpu
> sip:catt178 at vict-ims.net
>
> [root at vict-ims2 etc]#
>
>
>
>
>
> After catt REGISTER: catt_subscriber visible in DB and usrloc cache of
> .23 but missing in usrloc cache of .24
>
>
>
>
>
> MariaDB [scscf]> select * from impu;
>
> +-----+---------------------------------+---------+-----------+------+------+------+------+----------------------------------------------------------------------------------------------------------------------+
>
> | id | impu | barring | reg_state | ccf1 | ccf2
> | ecf1 | ecf2 | ims_subscription_data
> |
>
> +-----+---------------------------------+---------+-----------+------+------+------+------+----------------------------------------------------------------------------------------------------------------------+
>
> | 196 | sip:catt178 at vict-ims.net | 0 | 1 | NULL | NULL
> | NULL | NULL | catt178 at vict-ims.net sip:catt178 at vict-ims.net
> sip:+4350255872178 at vict-ims.net tel:+4350255872178 |
>
> | 197 | sip:+4350255872178 at vict-ims.net | 0 | 1 | NULL | NULL
> | NULL | NULL | catt178 at vict-ims.net sip:catt178 at vict-ims.net
> sip:+4350255872178 at vict-ims.net tel:+4350255872178 |
>
> | 198 | tel:+4350255872178 | 0 | 1 | NULL | NULL
> | NULL | NULL | catt178 at vict-ims.net sip:catt178 at vict-ims.net
> sip:+4350255872178 at vict-ims.net tel:+4350255872178 |
>
> +-----+---------------------------------+---------+-----------+------+------+------+------+----------------------------------------------------------------------------------------------------------------------+
>
> 3 rows in set (0.00 sec)
>
>
>
> MariaDB [scscf]>
>
>
>
>
>
>
>
> [root at vict-ims ~]# kamctl kamcmd ulscscf.showimpu sip:catt178 at vict-ims.net
>
> {
>
> impu: sip:catt178 at vict-ims.net
>
> state: registered
>
> barring: 0
>
> ccf1:
>
> ccf2:
>
> ecf1:
>
> ecf2:
>
> subscription: {
>
> impi: catt178 at vict-ims.net
>
> service profiles: {
>
> 1: {
>
> impus: {
>
> 1: sip:catt178 at vict-ims.net
>
> 2: sip:+4350255872178 at vict-ims.net
>
> 3: tel:+4350255872178
>
> }
>
> }
>
> }
>
> }
>
> contacts: {
>
>
> sip:catt178 at 193.154.113.40:5060;transport=UDP;rinstance=317-catt178: {
>
> expires: 3542
>
> client: n/a
>
> }
>
> }
>
> }
>
> [root at vict-ims ~]#
>
>
>
>
>
> [root at vict-ims2 etc]# kamctl kamcmd ulscscf.showimpu
> sip:catt178 at vict-ims.net
>
> [root at vict-ims2 etc]#
>
>
>
>
>
>
>
> After kamctl stop + kamctl start of .24 catt_subscriber is visible in usrloc
> cache of (.24): preload_data loads data from db at module init
>
>
>
> [root at vict-ims2 ~]# kamctl kamcmd ulscscf.showimpu sip:catt178 at vict-ims.net
>
> {
>
> impu: sip:catt178 at vict-ims.net
>
> state: registered
>
> barring: 0
>
> ccf1:
>
> ccf2:
>
> ecf1:
>
> ecf2:
>
> subscription: {
>
> impi: catt178 at vict-ims.net
>
> service profiles: {
>
> 1: {
>
> impus: {
>
> 1: sip:catt178 at vict-ims.net
>
> 2: sip:+4350255872178 at vict-ims.net
>
> 3: tel:+4350255872178
>
> }
>
> }
>
> }
>
> }
>
> contacts: {
>
>
> sip:catt178 at 193.154.113.40:5060;transport=UDP;rinstance=317-catt178: {
>
> expires: 2949
>
> client: n/a
>
> }
>
> }
>
> }
>
> [root at vict-ims2 ~]#
>
>
>
>
>
> Now deregister catt_subscriber from HSS1: catt_subscriber disappears from
> db and usrloc cache of (.23) but persists on (.24) as registered in usrloc
> cache
>
>
>
> HSS >hss.deregister_subscriber catt178 at vict-ims.net 0
>
>
>
>
>
> [root at vict-ims ~]# kamctl kamcmd ulscscf.showimpu sip:catt178 at vict-ims.net
>
> [root at vict-ims ~]#
>
>
>
>
>
> MariaDB [scscf]> select * from impu;
>
> Empty set (0.00 sec)
>
>
>
> MariaDB [scscf]>
>
>
>
>
>
> [root at vict-ims2 ~]# kamctl kamcmd ulscscf.showimpu sip:catt178 at vict-ims.net
>
> {
>
> impu: sip:catt178 at vict-ims.net
>
> state: registered
>
> barring: 0
>
> ccf1:
>
> ccf2:
>
> ecf1:
>
> ecf2:
>
> subscription: {
>
> impi: catt178 at vict-ims.net
>
> service profiles: {
>
> 1: {
>
> impus: {
>
> 1: sip:catt178 at vict-ims.net
>
> 2: sip:+4350255872178 at vict-ims.net
>
> 3: tel:+4350255872178
>
> }
>
> }
>
> }
>
> }
>
> contacts: {
>
>
> sip:catt178 at 193.154.113.40:5060;transport=UDP;rinstance=317-catt178: {
>
> expires: 2571
>
> client: n/a
>
> }
>
> }
>
> }
>
> [root at vict-ims2 ~]#
>
>
>
>
>
>
>
> Scenario of RTR from HSS after REGISTER of catt_subscriber at (.23) and
> outage of (.23):
>
> subscr. visible in db but not visible in usrloc cache of .24
>
> HSS sends diameter RTR message to (.24) and deregister callback in (.24)
> searches in usrloc cache and does not find catt_subscriber and fails.
>
>
>
> MariaDB [scscf]> select * from impu;
>
> +-----+---------------------------------+---------+-----------+------+------+------+------+----------------------------------------------------------------------------------------------------------------------+
>
> | id | impu | barring | reg_state | ccf1 | ccf2
> | ecf1 | ecf2 | ims_subscription_data
> |
>
> +-----+---------------------------------+---------+-----------+------+------+------+------+----------------------------------------------------------------------------------------------------------------------+
>
> | 196 | sip:catt178 at vict-ims.net | 0 | 1 | NULL | NULL
> | NULL | NULL | catt178 at vict-ims.net sip:catt178 at vict-ims.net
> sip:+4350255872178 at vict-ims.net tel:+4350255872178 |
>
> | 197 | sip:+4350255872178 at vict-ims.net | 0 | 1 | NULL | NULL
> | NULL | NULL | catt178 at vict-ims.net sip:catt178 at vict-ims.net
> sip:+4350255872178 at vict-ims.net tel:+4350255872178 |
>
> | 198 | tel:+4350255872178 | 0 | 1 | NULL | NULL
> | NULL | NULL | catt178 at vict-ims.net sip:catt178 at vict-ims.net
> sip:+4350255872178 at vict-ims.net tel:+4350255872178 |
>
> +-----+---------------------------------+---------+-----------+------+------+------+------+----------------------------------------------------------------------------------------------------------------------+
>
> 3 rows in set (0.00 sec)
>
>
>
>
>
> Cfg file of (.24):
>
> kamailio-scscf/kamailio-scscf-modules.cfg:modparam("ims_usrloc_scscf",
> "enable_debug_file", 0)
>
> kamailio-scscf/kamailio-scscf-modules.cfg:modparam("ims_usrloc_scscf",
> "matching_mode", 0)
>
> kamailio-scscf/kamailio-scscf-modules.cfg:modparam("ims_usrloc_scscf",
> "db_url", "cluster://cluster1")
>
> kamailio-scscf/kamailio-scscf-modules.cfg:modparam("ims_usrloc_scscf",
> "db_url", DB_URL)
>
> kamailio-scscf/kamailio-scscf-modules.cfg:modparam("ims_usrloc_scscf",
> "db_mode", 2)
>
> kamailio-scscf/kamailio-scscf-modules.cfg:modparam("ims_usrloc_scscf",
> "timer_interval", 10)
>
> kamailio-scscf/kamailio-scscf-modules.cfg:modparam("ims_usrloc_scscf",
> "timer_procs", 4)
>
>
>
> lg
>
> P
>
>
>
>
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>
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>
--
Carsten Bock
CEO (Geschäftsführer)
Meet us at MWC 2018 in Barcelona and see IMS and VoLTE in action!
(February 26th - March 1st, Hall 7 - Booth 7L80)
ng-voice GmbH
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