Device does not match acl

hello all

right i have changed something with in our gateway an now when i log into asterisk im getting:

NOTICE[5684]: chan_sip.c:14749 handle_request_register: Registration from ‘sip:"our anlogue phone number"@192.168.90.2>’ failed for 192.168.1.1 - device does not match ACL

anybody any ideas?

thanks