1300 and 1800 numbers are both considered to be ‘non-geographic’ numbers, meaning they are not linked to any particular location. They are both designed for business use. 1800 numbers are ‘Toll Free’ – free to call for the caller but the receiver pays for the inbound call. 1300 numbers are ‘shared cost,’ meaning that the caller will pay the cost of a local call and the receiver will also pay a lower rate for inbound calls.
SIP trunking is a service that allows companies to connect their onsite IP PBX (Phone system) to the Internet Telephony Service Provider (ITSP) and use its services; inbound phone numbers and outbound call termination. It is effectively a replacement of old PSTN phone lines. A SIP Trunk service can be used via public internet as well as via private IP connections.
‘Hosted PBX’ is used to describe a phone system that is hosted in the cloud (or Internet) and works via VoIP (Voice Over Internet Protocol).
Some benefits of Hosted PBX include being location independent, not needing equipment, and being easy to manage. Add and remove phones when required, with minimal configuration. Hosted PBX offers a significantly richer feature set compared to older on-premise deployments.