From VTwiki

How Do I Use the Speed Dial Feature?

To setup your Speed Dial feature, please login your Control Panel and select the 'Speed Dial' icon under VT_Advanced Features. Simply enter the 11 digit number you would like to program and click Add.

To use the speed dial numbers once you create them, dial *(two digit number) on your viatalk phone. Example: Speed Dial 01 would be *01