>From that link you provided... 

*Note:* Not all Android-powered devices support VOIP calls using SIP. You 
should always call 
isVoipSupported()<http://developer.android.com/reference/android/net/sip/SipManager.html#isVoipSupported(android.content.Context)>
 to 
verify that the device supports VOIP calling and 
isApiSupported()<http://developer.android.com/reference/android/net/sip/SipManager.html#isApiSupported(android.content.Context)>
 to 
verify that the device supports the SIP APIs.

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