[OpenSIPS-Users] Event E_UL_CONTACT_DELETE delayed

[Callum Guy]

Hi Team,

I just wanted to report an incorrect behaviour for a comment from the dev
team.

I'm operating an RTC registrar on 3.2.4 and defining that each device (web
console) can have a maximum of one active contact, overridden by any new
registration for that AoR. The previously active devices are notified via
an internal API call whenever the E_UL_CONTACT_DELETE event is raised,
indicating that the session has been closed.

This works great most of the time however in certain situations such as
when a call has recently ended on one device the contact delete event is
often delayed by a minute or so. I have resolved this issue by changing
the sql_write_mode for usrloc to "write-through" rather than the more
performant "write-back" setting I typically rely on.

Is there any technical reason why we can't have the event generated at the
time that the old contact is flagged as deleted rather than the time that
this is persisted to the database, as appears to be the current behaviour?
I'm comfortable running in write-through mode for now but if there is a
scope to fix this I think raising the event in a timely manner seems the
correct thing to do.

Many thanks,

Callum

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