• 4 or 8 Ports FXS
• Router
• 2x 10/100 Ethernet

http://www.freepbx.org/forum/freepbx/tips-and-tricks/how-to-grandstream-gxw-4104-setup

• 4 or 8 Ports FXO
• 2x 10/100 Ethernet

• DHCP client by default
• Factory reset
  • Press reset button for 7 seconds
• Voice menu
  • Connect analog phone or butt set to FXS port
  • Dial three asterisks for voice menu
    • Then dial 02 to hear current IP address
• Default password
  • admin

Start from factory default settings and use a web browser to access the current IP address.

• Time Zone

• Active = yes
• Primary SIP Server = inbound23.vitelity.net
• Outbound Proxy = outbound.vitelity.net
• SIP User ID = <sub_acct_user_id>
• Authenticate ID = <sub_acct_user_id>
• Authenticate Password = <sub_acct_password>
• Apply and Reboot

Factory default:

{ x+ | *x+ | *xx*x+ }

7 and 11 digit dialing, plus emergency and international:

{<=1520>[2-9]xxxxxx|1[2-9]xx[2-9]xxxxxx|[89]11|011x+}