What is SIP trunking?

SIP trunking allows PBX phone system to send and receive business calls through the internet. A SIP (Session Initiation Protocol) is deployed for signalling protocols for voice calls, video calls, streaming media and messaging applications. To make NBN work, it is necessary to choose SIP trunk plans according to the business requirement.

Well, SIP trunking does not require much amount of hardware tools or any specific engineer to set it up for any business. The primary components which you require are: ISP (Internet Service Provider), a PABX phone system and a SIP gateway that controls the network between ISP and PABX.