[Spce-user] Upper registration to Asterisk - phones unreachable after a while

[African Axess African Axess]

Hi

With the help of this list I have upper registration working and can phone
between extensions. However, at (seemingly) random, the devices cannot be
reached. All appears fine and they appear registered, but when I make the
call it doesn't work, until I log into my device and click "re-register".
The proxy log is fairly clear:

Feb 15 08:13:22 sipwise /usr/sbin/kamailio[2138]: INFO: <script>: Local
user offline - R=sip:user404 at my.domain.com:5060
;uuid=c6d7434d-5026-4394-86d5-d3c43d2fd2cc

telling me that the user is offline. Question of course is - how do I avoid
them going offline. The phones are set to re-register every 60 seconds, but
that doesn't seem to do the trick. Once this happens, only a physical
"re-register" the phone by doing it manually gets it back up again. This is
with SNOM 300 phones.
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