First of all, please open the Virtual Line configuration board. If you forgot or do not know how to access to it, please follow this link.
Below guidance is for scenario of Call Flow with Ring Group
Step 1: Set Welcome Message
Then, you can follow this link for setup a Welcome Message to sound more professional and create a Extension offer to guide your Caller reach the right person.
Step 2: Create the group of numbers to receive the calls
Step 3: Record Missed calls and notify