Step 1: First you will need to factory reset the phone.
Press Menu → Setting → Advanced Setting (default password: admin) → Factory Reset. Press OK soft key in the warning page.
Step 2: To find your phone’s IP address, simply press the key and select Network on the phone.
Step 3:Point your browser to the web interface of your H-Tek IP phone, which in this example is http://192.168.7.102
Enter your phone’s login credentials – username and password is admin by default.
Step 4: Click on the Account tab and enter the following information.
Account Active: Yes
Label & Name: Enter the name you want to appear on the phone’s display
SIP User ID: < sip username >
Authenticate ID: < sip username >
Authenticate Password: < sip password >
Primary SIP Server: siptrunk.callacloud.com
Step 5: Once you’ve entered all the details in the accounts page click on Save Set and Restart.
For International Prefix: 00 +
You can buy from our website if you don’t have an SIP account www.callacloud.com