Here is a configuration example that works for Unlimitel voip provider. On the 1st line of the adapter you will see the Unlimitel settings, and on the second line Vbuzzer settings (vbuzzer is currently disabled but the settings are ok).
These configurations worked for the above mentioned providers. The ATA box is not the current router, but the actual router has the ports UDP :5060 and UDP:5061 forwarded to this ATA box (in the exemple below ATA box has the IP 192.168.15.60) . This example also works with Direct IP dialing and sipbroker because its soket (IP+UDP port) is accessible from the internet. Also the STUN server settings are important for that to work fine, (both ways audio).
The address for this page is ussually http://192.168.15.1/Voice_adminPage.htm
Enjoy!
(Everything in red is to be changed according to your settings (User ID, passowrd Name, DNS IP)
Info Page
System Page
Sip Page
Provisioning Page
Regional Page
Line 1 Page
Line 2 Page
User 1 Page
User 2 Page
Article source: millionguides.com