1. Download free version of X-Lite softphone from developer's web-site and start installation.
2. Start application, then click Account Settings link (or select Softphone | Account Settings in top menu).
3. Enter profile name, for example, MCN.
Domain: enter SIP-domain address from registration email
User ID: your SIP ID
Password: your SIP password
Display name: your SIP ID
Authorization name: your SIP ID
4. Click Transport tab. Set UDP as signaling transport protocol.
5. Click Advanced tab.
Reregister every: 120 seconds.
Send SIP keep-alives: on
Use rport: unset
6. Click OK button to save your settings.
Your application is ready to use!
Free version of X-Lite has limited options and may display advertisement.