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There are two ways you can setup your VOIP phone system, either you get phone DID or extension for each of your IP phones or you can have a SIP (Session Initiation Protocol) trunk. Getting SIP trunks is cheaper but you will be limited to concurrent calls. For example if you get 5 IP phones and get 5 DIDs or extensions, you can make 5 concurrent calls but if you have a SIP trunk of 2 lines over a 5 IP phones network, you will be limited to only 2 concurrent lines. You can always add more channels (or lines) to your SIP trunk if you notice that 2 lines are not enough.

SIP trunks are more suitable to bigger businesses where they have multiple IP phones but don’t make or receive many calls. Primax offers SIP trunks with unlimited local, national, mobile and 1300/1800 calls and can also terminate SIP trunks on your in-house PBX or you can use our Cloud PBX.

You can also port your number on SIP trunks and Primax will help you move your phone or fax numbers across.

For further information, please email us at or call us on 02 9133 1307

Get Started With SIP Trunks

Complete alternative to your conventional copper line phone system. Business grade carrier, crystal clear voice quality and friendliest support.

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