baffled by defaultuser on aastra 9133i

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1.6.2.13, sip.conf:

[155]
type=friend
context=longdistance
callerid=”Admin” <155>
secret=test
host=dynamic
dtmfmode=rfc2833
allow=all
defaultuser=155-trust
…………

On aastra:

Basic SIP Authentication Settings
Screen Name
Phone Number 155
Caller ID 155
Authentication Name 155-trust
Password test

But:

WARNING[1737]: chan_sip.c:12800 check_auth: username mismatch, have
<155>, digest has <155-trust>
NOTICE[1737]: chan_sip.c:21687 handle_request_register: Registration
from ‘155 ‘ failed for ’10……….’ –
Username/auth name mismatch

How do I set this so the Authenication is not the same as the extension?

sean