You can have as many VoIP users (or extensions) as you need.  VoIP users can use a softphone app like Grandstream wave for mobile or zoiper for desktop softphones to turn the device into an extension to make and receive calls.  Or if you already have a VOIP phone you can configure that to use on our network too.

VoIP users each get an individual extension number, and can call each other free just by calling their extension number. This allows you to call between devices like a laptop and a mobile phone free of charge.

VoIP users are added via your customer portal and are charged at £4 per month and include a bundle of 100 minutes of outbound calls.