Dvg1120S won't Register

I'm trying to get my dlink dvg1120s to register to an extension and I'm having no luck. It registers to my voip provider (voip.ms) just fine. Settings are below. Am I missing something?

Server Settings
Server FQDN enabled
IP Address . . .
Domain Name pbxes.org
Port 5060
Service Domain pbxes.org
URL Format SIP
User Parameter Phone enabled
Timer T2 4sec

Initial Unregister enabled
Register Expiration 3600 sec
Session Expires 180 sec
Min-SE 180 sec
Session Expires Refresher uac

Codec Priority & Packet Interval
G.711a-law 2nd 20 ms
G.711u-law 1st 20 ms

User Agent Settings
Same Phone Number enabled
Index 1
Phone Number myaccount-101
Display Name myaccount-101
Caller ID Delivery yes
Display CID enabled
User Agent Port 5060
Authentication Username myaccount-101
Authentication Password extpassword
Confirm Password extpassword