Hello everyone,
Following up on this thread, I have been testing the `usrloc` keepalive feature
to detect zombie registrations. However, I noticed that it seems to take a
relatively long time to actually detect and remove the dead contacts.
Here is the setup and the test I performed:
**Kamailio version:** v6.1.2
**Module parameters:**
```text
modparam("nathelper", "natping_interval", 0)
modparam("usrloc", "timer_interval", 30)
modparam("usrloc", "timer_procs", 2)
modparam("usrloc", "use_domain", 0)
modparam("usrloc", "db_url", DBURL)
modparam("usrloc", "db_mode", 2)
modparam("usrloc", "ka_mode", 4) # udp only
modparam("usrloc", "ka_timeout", 40)
modparam("usrloc", "ka_interval", 30)
modparam("usrloc", "ka_randomize", 5)
modparam("usrloc", "ka_loglevel", 2)
modparam("usrloc", "ka_logmsg", " to-uri: [$tu] remote-addr: [$sas]")
modparam("usrloc", "ka_method", "OPTIONS")
```
**Test Timeline:**
* **21:57:27** - Received `REGISTER` message from MicroSIP.
* **21:58:25** - Sent keepalive `OPTIONS` to the registered contact.
* *(At this point, I killed the MicroSIP process to simulate a zombie
registration)*
* **21:59:09** - Log shows: `DEBUG: usrloc [ul_keepalive.c:126]:
ul_ka_urecord(): keepalive for aor: 1001`
* **21:59:09** - Log shows: `DEBUG: usrloc [ul_keepalive.c:157]:
ul_ka_urecord(): set expired contact on keepalive (1779332305 + 40 <
1779332349) - aor: 1001 c: sip:[email protected]:61876;ob`
* **22:00:01** - Log shows: `DEBUG: usrloc [urecord.c:393]: wb_timer(): Binding
'1001','sip:[email protected]:61876;ob' has expired`
As seen above, there is quite a delay from the moment the endpoint dies to the
moment `wb_timer()` finally expires the binding.
Is there anything wrong with my current approach or configuration? Are there
any recommended ways to further optimize this and speed up the detection and
removal of zombie registrations?
Thanks in advance for any insights!
Best regards,
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