asterisk users - Jun 2006 - Why are sip-channels too lagged?

Hello,

I am getting lots of messages as the ones attached below. Is this a 
problem anybody can explain. (My internet connection is NOT slow or 
instable... thus I don't get it.) Maybe does this result from incorrect 
registration?

Cheers,
Arik


----- sip.conf ------
[general]
qualify=no
srvlookup=yes
canreinvite=yes
register => xxxxx:xxxx@sipgate.de/xxxx

[sipgate]
type=friend
language=de
insecure=very ; otherwise I get authentication errors
nat=yes
username=xxxx
fromuser=xxxx
fromdomain=sipgate.de
secret=xxxx
host=sipgate.de
qualify=yes
context=sipgate

----


----
Jun  7 16:20:32 NOTICE[3160]: Peer 'sipgate' is now REACHABLE!
Jun  7 16:22:36 NOTICE[3160]: Peer 'sipgate' is now UNREACHABLE!
Jun  7 16:22:46 NOTICE[3160]: Peer 'sipgate' is now REACHABLE!
Jun  7 16:26:51 NOTICE[3160]: Peer 'sipgate' is now UNREACHABLE!
Jun  7 16:27:02 NOTICE[3160]: Peer 'sipgate' is now REACHABLE!
Jun  7 16:29:06 NOTICE[3160]: Peer 'sipgate' is now UNREACHABLE!
Jun  7 16:29:17 NOTICE[3160]: Peer 'sipgate' is now REACHABLE!
Jun  7 16:29:31 WARNING[3160]: Maximum retries exceeded on call 
679dc2b12a11707031774c0b02ac613b@127.0.0.1 for seqno 12552 (Critical 
Request)
Jun  7 16:29:45 NOTICE[3160]:    -- Registration for 
'6264261@sipgate.de' timed out, trying again
Jun  7 16:31:22 NOTICE[3160]: Peer 'sipgate' is now UNREACHABLE!
Jun  7 16:31:39 WARNING[3160]: Maximum retries exceeded on call 
679dc2b12a11707031774c0b02ac613b@127.0.0.1 for seqno 12554 (Critical 
Request)
Jun  7 16:31:53 NOTICE[3160]:    -- Registration for 
'6264261@sipgate.de' timed out, trying again