You can configure every agent a different call forwarding number, this could be useful if your agent needs to answer calls in his personal phone number or if you have specific phone lines for calls made when you are not in business hours or when everyone is offline.
For example, if you have a mobile phone for support and another for sales, you could configure the support phone number for some agents and sales phone number for the rest of your team as the call forwarding phone number.
If you need to configure call forwarding you could read these articles: