Click to dial SIP URI for Android and iPhone

Looking for an app for iphone and android App should have the option to enter and save a SIP URI and have the option to automatically dial that SIP URI when the application is opened. This needs to be a quick one-button connection for the end user. Would like the application to run in the background so user can multi task App needs to work with handset, speaker, or bluetooth device A widget to start/stop the app from the homescreen would be nice Most likely development tool: [login to view URL]