I am facing very similar problem. the sip phones can registered, online and ul show can see the phones. but after while (less 5 min), kamailio show the error:

binding ....... has expired. I change to db_mode=2, the problem still there. after restart kamailio again, the phones come on.

2014-05-08 6:08 GMT+08:00 Henry Fernandes <henry@usinternet.com>:

I'm using Kamailio 3.3 and the USRLOC module to track registrations. I have set "db_mode" to 1 because I want to store all registration info to the database and I want the database to be up to date (in case I need to restart Kamailio).

Unfortunately, this doesn't work as I expect. When I query the database, it has far fewer entries in the "location" table than are registered to Kamailio (which I find with a "kamctl ul show"). Also, when I restart Kamailio, I lose some of the registrations for my phones.

Am I misunderstanding the behaviour for db_mode=1? Isn't it supposed to keep the database up to date?
-H
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Best regards