How to configure Telephone.app for macOS / OS X
Edited
To add a softphone to your Mac, search the Mac App Store for Telephone. It's a free and easy app for Macs.
Follow these steps to activate a device with the app:
- In Platform, add the Device and assign User as neded. 
- In Platform, while looking at the Device, use the Advanced view to find the SIP credentials we'll need below. 
- In Telephone app, choose Preferences, and the + to add an account. 
- For Full Name, enter a nick-name for the app. (Can be anything) 
- For Domain, enter the sever (or realm) for your account. 
- For User Name, enter the username from the Device in Platform above. 
- For Password, enter the password from the Device in Platform above. 
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