I just bought a aastra 9133i to see if it would be better than our gxp2000s. I just set it up real quick and everything seems to work fine when calling other sip extensions, but when I make a call on our outside line it just fails. I am using the same asterisk account that works fine on both our grandstream and linksys phones. It’s almost like the 9133i doesn’t work with my calling rules. Any ideas?