Download the .APK file: Linphone.apk
belledonne-communications.com's SIP Compatible Andorid softphone with modifications to auto-provision from a specific URL feeding XML based on the device IMEI number.
A comparison with the native Android SIP client (on a Samsung Galaxy S3).
If you want an .APK or the source of any of these projects please contact me and ask. I would love to hear from you.