iMXFone (iPhone & Android) Overview  

(Screenshot)

Simply a SIP phone (for iPhone & Android devices) connects to IMX system and other SIP servers.

Download links :

iMXFone (iPhone - App Store) : http://itunes.apple.com/us/app/imxfone/id435088416?mt=8
IMXPhone (Android - Android Market): https://market.android.com/details?id=com.etellicom.sip