[SR-Users] unregister user when kamailio looses TCP connection.

[Vitaliy Aleksandrov]

> Also, if I didn't get it wrong, it works only with in-memory records, 
> if the usrloc is configured in db-only mode, it does not work with 
> current patch, right?
>>>
>> To remove old contacts i've used delete_ucontact from usrloc api. 
>> This function checks db_mode and removes contact from db in case of 
>> DB_ONLY mode and just updates expiration in case of WRITE_BACK.
>
> But the issue would be that the hash tables will not be in memory, so 
> you will not get in this way to call the delete_ucontact() function. 
> This function is called via a different code path for db only mode.
Tnx, good remark. It shows that I missed how DB_ONLY mode works. Will 
spent some time to examine it.
Just remembered that kamailio can close connection from its side due to 
tcp_connection_lifetime parameter. Haven't checked where how it works.