Thanks for an answer. 
Appears to be, there is a problem within a proxy in front of FS….. 

2016-03-08 6:09 GMT+02:00 Nandy Dagondon <nandy1925@gmail.com>:

The expiration of SUBSCRIPTION should take care of that - no NOTIFY messages will be sent for off-line phone (w/ expired registrations). So, take note SUBSCRIPTION time shouldn't be too long - a minute longer that of the re-REGISTRATION time.

Just my cents worth.

On Tue, Mar 1, 2016 at 5:31 AM, Igor Olhovskiy <igorolhovskiy@gmail.com> wrote:
Hi!

I have a phones inside my network with BLF widely used. As they are inside network, I’ve set 
all-reg-options-ping on internal profile along with unregister-on-options-fail. Main issue - when phone for some reason goes offline, and FreeSwitch unregisters it, it does not sent NOTIFY to watchers (and they are there) to indicate this phone is offline. On any other cases BLF works fine.
Is this a bug or I’ve missed some parameter on profile?

Thanks.

--
Best regards,
Igor

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_________________________________________________________________________
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--
Best regards,
Igor