[Asterisk-Users] AAstra 9133i register double account.. ??

[nik600]

hi

i've got an AAstra 9133i ip phone, when i've bought it, i've set it to
use a SIP/400 account on my asterisk, then, i've changed settings and
i've set set phone to use a SIP/500 account .

now, when i connect the phone to tthe network, it register itself on
asterisk with both accounts!!!

   -- Registered SIP '500' at 192.168.100.188 port 5060 expires 120
   -- Registered SIP '400' at 192.168.100.188 port 5060 expires 120

how can i avoid this? i want to register only SIP 500!!

this is a piece of my sip.conf


[400]
username=400
type=friend
secret=400
record_out=Adhoc
record_in=Adhoc
qualify=no
port=5060
nat=never
mailbox=400 at device
host=dynamic
dtmfmode=rfc2833
context=from-internal
canreinvite=no
callerid= <400> My user

[500]
username=500
type=friend
secret=500
record_out=Adhoc
record_in=Adhoc
qualify=no
port=5060
nat=never
mailbox=500 at device
host=dynamic
dtmfmode=rfc2833
context=from-internal
canreinvite=no
callerid= <500> Postazione 500


can you help me please?
thanks