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java.lang.NullPointerException: 	at gov.nist.javax.sip.SipProviderImpl.getNewClientTransaction(SipProviderImpl.java:401)	at net.java.sip.communicator.impl.protocol.sip.CallPeerSipImpl.sayCancel(CallPeerSipImpl.java:1117)	at net.java.sip.communicator.impl.protocol.sip.CallPeerSipImpl.hangup(CallPeerSipImpl.java:1022)	at net.java.sip.communicator.impl.protocol.sip.OperationSetBasicTelephonySipImpl.hangupCallPeer(OperationSetBasicTelephonySipImpl.java:1929)	at net.java.sip.communicator.impl.protocol.sip.OperationSetBasicTelephonySipImpl.hangupCallPeer(OperationSetBasicTelephonySipImpl.java:1907)	at net.java.sip.communicator.impl.gui.main.call.CallManager$HangupCallThread.run(CallManager.java:3306)