How can I tell which extension a call is coming from?
Within the Grasshopper site, you can set your phone number to be the forwarding number for multiple extensions, including a department extension and an employee extension.
If you do have one number for multiple extensions, you can set up call announce to say which extension the call is coming from!
When you receive a call, you will hear the Grasshopper system say "You have a call from (plays extension name). Press 1 to accept or press 2 to send the call to voicemail."
Check out this article to learn how to activate the call announce or call screening: How do I change or add a call forwarding number?