Usually these ATAs are set in router mode so you should be able to get into them easily.

1. To access the interface go here: http://192.168.2.1
2. Next you need to type in “admin” and press enter . The Advanced Settings will open up.
3. Notice the “SIP Server” , “SIP User ID” and “Authenticate Password” all have entries.

• SIP Server: Always enter voip.vif.com
• SIP User ID: Given by the ISP and its mostly in the client's account
• Authenticate Password: is also given by the ISP and in the client's account also.

4. These are info the client needs if ever the Grandstream HT-486 has been reset. Next we scroll down to “Register Expiration”

5. Always have “Register Expiration” set to 60 Seconds. Now we scroll down to “Enable Call Features” and “Send DTMF”

• “Enable Call Features”: must be set to Yes
• Send DTMF: must be set to via RTP (RFC2833) (normally its put on in-audio which you must remove or else the voice mail box will not work.)

6. Now we head to Reply to ICMP on WAN port and WAN Side HTTP Access

• Reply to ICMP on WAN port: Set to YES
  
• WAN Side HTTP Access: Set to YES
  

7. Now go all the way to the bottom and click Update.

8. Then you will get this page

9. Before Rebooting we move onto the basic settings.