How to Determine if Android Device Supports SIP-based VOIP

public static final String FEATURE_SIP_VOIP was added in API level 9
Feature for getSystemAvailableFeatures() and hasSystemFeature(String).

The device supports SIP-based VOIP.
Constant Value: "android.software.sip.voip"

1. Get a PackageManager Instance named myPackageManager.

2. Create a Boolean Variable named bolVOIPSupported. 

3. Set the Minimum and Target SDK version  to 9 or greater. 

4. In the onCreate method, add the below code. This will return the SIP-based VOIP availability to a boolean named bolSIPSupported. It will then display a toast displaying the SIP-based VOIP availability of the device to the user.

bolVOIPSupported = myPackageManager.hasSystemFeature(PackageManager.FEATURE_SIP_VOIP);

if (bolVOIPSupported) {

Toast.makeText(this, "Device supports SIP-based VOIP", Toast.LENGTH_LONG).show();

} else {

Toast.makeText(this, "Device does NOT support SIP-based VOIP!", Toast.LENGTH_LONG).show();

}

5. Compile and run!

Resources:
http://developer.android.com/reference/android/content/pm/PackageManager.html#FEATURE_SIP_VOIP