1. On the Swyx server, right click on a user and go into Properties and then Administration. Then setup SIP authentication.
2. Download the Bria SIP Client to your iPhone from the Apple App Store or similarly, this will work on all Smartphones.
3. Setup a VPN on your Smartphone to connect into the office
4. Now connect the VPN and you’ll be able to log on to the Bria SIP client and start making calls