1. Download free application Telephone from AppStore.
Start the application. There will be opened the Account Setup window.
Enter your SIP account settings:
Full Name: Enter profile name, for example, MCN
Domain: SIP-domain address from registration email, for example sip.mcntele.com
User Name: your SIP ID
Password: your SIP password
Click Done button.
2. There will be opened new window with empty field.
Enter Extension number to the field, then click Enter to make a call.
3. If you click to window, its menu show on top. There you can make additional settings.
Your application is ready to use.