asterisk users - Sep 2010 - 1.6.2.11 realtime sip registrations disappear from DB

Hello list,

I'm using asterisk 1.6.2.11 with realtime SIP (mysql DB).

I notice that when the SIP peer registers, the fields 'fullcontact', 
'ipaddr', 'port', 'regserver', 'regseconds',
'lastms' are filled with
values.

But after a while, these fields become empty.

Asterisk CLI shows :

asterisk*CLI> sip show peers
Name/username              Host            Dyn Nat ACL Port     
Status     Realtime
sterk1/sterk1  192.168.1.102    D   N      5062     OK (30 ms) Cached RT
test13/test13      192.168.1.100    D   N      5060     OK (4 ms)  Cached RT
test2/test2        192.168.1.102    D   N      5061     OK (30 ms) Cached RT
test6/test6        192.168.1.104    D   N      5063     OK (12 ms) Cached RT


So Asterisk is still aware of the realtime SIP peers, and they are still 
reachable and working (IP-phones).

But why do the fields in the mysql DB become empty ?!

Is this a bug ?! (in asterisk 1.4.30 the fields remain filled until 
unregister)


Kind regards,
Jonas.
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