If an inbound call is routed to a phone from a phone number, it will ring for a defined ring time, and then the call will disconnect. For example, an incoming call rings to phone 101, and since there are no "Try First," "If Busy," or "If Not Answered" options, it will drop off if not answered.
When routing to an extension, users have configuration options that allow the call to be routed to "Try First," "If Busy," or "If Not Answered." If an inbound call is routed to extension 101 it will "Try First" phone 101. If they do not answer, it will route to the "If Not Answered" option which is commonly a mailbox or a "Find Me" option. Most often, the "Find Me" routing will go to the user's cell phone. For more information on "Find Me," please click here.
Routing to an extension gives the user more options than routing to a phone.