Hung-ying Tyan 5bd3782f24 Check if VoIP API is supported in SipManager.
This is to make SipManager.isVoipSupported() effective.
Also add NPE check now that we may return null SipAudioCall when VOIP is not
supported.

Bug: 3251016

Change-Id: Icd551123499f55eef190743b90980922893c4a13
2010-12-21 11:51:03 +08:00
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