Zoiper allows for easy phone management, especially for remote employees. It also has a contacts feature that even many physical VOIP phone solutions lack, and can track network traffic to ensure the best quality connection. Furthermore, it allows you to set the ringtone to a different audio device than the in-call audio, so you can set the ringtone to an external speaker and not have to wear your headset until a phone call comes in.

Easy to use even to the new guys and client

Integration with FreePBX was simple, extension and password, worked right off the bat and the interface was nice and modern.