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Say you only want to route the traffic of a single application through a VPN.

(Because the application lacks proper encryption support or the remote service is only available on a cooperate network.)

Other stuff like web-browsing should go through the normal data connection.

How to configure this on a recent Android device (>= Android 4.0)?

Concrete motivation: Unfortunately, quite a few VoIP gateway providers do not provide encryption of data (voice and signaling) - thus using a VPN is necessary (at least when connected via WLAN). One provider (sipgate.de) even provides its own VPN (and no other SIP/RTP encryption methods).

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More information about which apps you are specifically trying to tunnel may help. Do they support SOCK5 Proxy? SSH Tunnel may be a good start. –  earthmeLon Aug 9 '12 at 18:49
@earthmeLon, VoIP apps, VoIP apps which support SIP - cf. the last paragraph of the question - e.g. CSimple. –  maxschlepzig Aug 13 '12 at 21:09

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