There isn't a single guide for three way calling as this isn't a feature that is server side.
Unlike traditional landlines where the call is joined at the exchange, with VoIP this is dealt with by the handset.
If you've purchased one of our supported handsets, do get in touch via the portal and we can help with the steps you need to follow to create a conference call, which is what they're generally referred to on digital services.
For handsets that we don't support, do check out the user guide on how to join two calls for a conference as that will give the same outcome but as every handset is different, the steps to follow will also differ.
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