Below is the configuration guide for the Dlink DVG-G1402S router:

Step 1 - Open your web browser and enter the IP address of the router. Enter user name (admin) and your password (admin by default).

Step 2 - Click on Home > VoIP.

Step 3 - Click on 'Server Configuration'. Specify the following settings:

Server FQDN - Enabled
Domain Name - sip.clickncallnow.com
Port - 5060

Secondary Server FQDN - Disabled

Outbound Proxy State - Enabled
Outbound Proxy Server FQDN - Enabled
Outbound Proxy Domain Name - sip.clickncallnow.com
Outbound Proxy Port - 5060

Service Domain - sip.clickncallnow.com
URL Format - SIP-URL
User Parameter Phone - Disabled
Caller ID Delivery - Yes
Display CIS - Enabled
Timer T2 - 4 sec

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

G.711a-law - 2nd - 20 ms
G.711u-law - 2nd - 20 ms
G.729a - 1st - 20 ms
G.726 - not used

Click on Apply when done.

Step 4 - Click on VoIP and then on 'User Agent'. Specify the following setings:

Same Phone Number - Enabled
Phone Number - cncn number
Display Name - cncn number
User Agent Port - 5060
Authentication Username - cncn number
Password - [your SIP password]
Retype Password - [your SIP password]

Click on Apply when done.

Step 5 - Click on Tools > Reboot and press on Reboot button. Wait until the router restarts. If you are successfully authenticated by the VoIP SIP server you should hear a dial tone in your handset.