SIP Switch
Android 2.3 (Gingerbread) and newer has a built in SIP/VoIP client. The widget has two buttons: The left one gives you a shortcut to the SIP settings i.e. to enable incoming calls. The second one allows you to select how calls should be routed primarily: you can select whether all calls should be made via SIP by default; only Internet calls via SIP (Airplane mode), or if you want to be asked before each call.
Packages
Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.
Download F-Droid-
This version requires Android 2.3.3 or newer.
It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.
Download APK 510 KiB PGP Signature
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This version requires Android 2.3.3 or newer.
It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.
Download APK 508 KiB PGP Signature