Help Registering Cisco Voice Gateway

Has anyone here been able to get a Cisco Voice Gateway (VG202 in my case) registered with voip.ms? When it attempts to register I’m seeing a 401 unauthorized response from voip.ms. Trying the same using microsip on the same network works without issue. My config is below. Note that everything between <> was intentionally omitted.

Current configuration : 4013 bytes
!
version 15.9
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname
!
boot-start-marker
boot-end-marker
!
!
logging buffered 4096
!
no aaa new-model
!

!
!

!
!
!
!
!
!
ip domain name
ip name-server
ip cef
no ipv6 cef
!
!
!
!
!
!
voice service voip
ip address trusted list
ipv4 208.100.60.6
!
!
!
!
voice translation-rule 1
rule 1 /3000/ //
!
voice translation-rule 2
rule 2 // /3000/
!
!
voice translation-profile INBOUND-FROM-ITSP
translate called 2
!
voice translation-profile OUTBOUND-TO-ITSP
translate calling 1
!
!
voice-card 0
!

!
!
!
!
!
!
!
!
!
!
!
!
interface Loopback1
ip address 255.255.255.252
shutdown
!
interface FastEthernet0/0
ip address 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
ip default-gateway
ip forward-protocol nd
!
no ip http server
no ip http secure-server
ip route 0.0.0.0 0.0.0.0
ip ssh version 2
!
ipv6 ioam timestamp
!
!
control-plane
!
!
voice-port 0/0
!
voice-port 0/1
!
mgcp behavior rsip-range tgcp-only
mgcp behavior comedia-role none
mgcp behavior comedia-check-media-src disable
mgcp behavior comedia-sdp-force disable
!
mgcp profile default
!
!
!
!
dial-peer voice 105 pots
translation-profile outgoing INBOUND-FROM-ITSP
destination-pattern 399037
port 0/0
forward-digits all
!
dial-peer voice 107 voip
translation-profile outgoing OUTBOUND-TO-ITSP
destination-pattern [2-9]…[2-9]…
session protocol sipv2
dtmf-relay rtp-nte sip-kpml sip-notify
codec g711ulaw
!
dial-peer voice 108 voip
translation-profile outgoing OUTBOUND-TO-ITSP
destination-pattern 1[2-9]…[2-9]…
session protocol sipv2
session target dns:.chicago4.voip.ms
dtmf-relay rtp-nte sip-kpml sip-notify
codec g711ulaw
!
!
sip-ua
credentials username password realm chicago4.voip.ms
authentication username password realm chicago4.voip.ms
no remote-party-id
registrar 1 dns:chicago4.voip.ms expires 3600
!
!
!
line con 0
login local
no modem enable
line aux 0
line vty 0 4
login local
transport input ssh
!
!
end