"A 1300 number (or 1-300 number) is classified as an inbound service because it charges the inbound call to the business receiving the inbound call. Other networks include outbound, mobile, satellite, VoIP etc. A 1300 number inbound service connects with the various other networks to deliver the 1300 number call to the business receiving the 1300 number call.
1. Most widely recognised marketing number in Australia. Look around...