Thread: android sipmanager throwing nullpointer

hi i am trying to make a sip call using android api the code is below. the setRegistration Listener method is throwing an nullpointer for my sipprofile but the profile prints fine so am at a bit of a loss as to why its throwing the error. am very new to android this is my first project so any help would be great thanks.

 
public void MakeACall(String a){
		try {
 
			String ad="calling "+a;//a is peer address
			res1.setText(ad);//res1 is textview
			String b=sp("name","getonsip.com","pass").getUriString();//local profile
			res1.setText(b);			
                        System.out.println(b);//prints the sip profile fine
			SipProfile mSipProfile = sp("name","getonsip.com","pass");
			SipManager mSipManager =SipManager.newInstance(MainActivity.this);			
			mSipManager.setRegistrationListener(b,//nullpointer error is thrown here<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
					new SipRegistrationListener() {
                public void onRegistering(String localProfileUri) {
                    res1.setText("Registering with SIP Server...");
                }
 
                public void onRegistrationDone(String localProfileUri, long expiryTime) {
                	res1.setText("Ready");
                }
 
                public void onRegistrationFailed(String localProfileUri, int errorCode,
                        String errorMessage) {
                	res1.setText("Registration failed.  Please check settings.");
                }
            });
 
			SipAudioCall.Listener whatWasThat = new SipAudioCall.Listener() {	    		
	    	@Override
	    	public void onCallEstablished(SipAudioCall call) {
	    	call.startAudio();
	    	call.setSpeakerMode(true);
	    	call.toggleMute();
	    	res1.setText("calling");
	    	}
	    	@Override
	    	public void onCallEnded(SipAudioCall call) {	    	    
	    		res1.setText("ended");
	    	}
	    	};
 
 
	        mSipManager.makeAudioCall(sp("name","getonsip.com","pass").getUriString(), 
	        		sp("other","getonsip.com","pass").getUriString(), whatWasThat, 30);
 
		} catch (java.text.ParseException e) {
			System.out.println("error with profile string thing");
			e.printStackTrace();
		} catch (SipException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}//end makecall()

hi i am pritty sure from studying logs it actually a problem with gnerating the profile so the error is in sp() here is the code incase anyone can help

public SipProfile sp(String a1,String b1,String c1) throws ParseException {	//generates sip profile	username,domain,password
	SipProfile Profile = null;
 
	SipProfile.Builder  builder = new Builder(a1,b1);
 
	builder.setOutboundProxy("proxy.sipthor.net");
	//builder.setAuthUserName("getonsip_username");
	builder.setPort(5060);
	builder.setProtocol("UDP");
	builder.setPassword(c1);
    Profile = builder.build();
//    System.out.println(Profile.getDisplayName());
//	System.out.println(Profile.getPassword());
//	System.out.println(Profile.getPort());
//	System.out.println(Profile.getProfileName());
//	System.out.println(Profile.getProtocol());
//	System.out.println(Profile.getSipDomain());
//	System.out.println(Profile.getUserName());
 
 
	return Profile;

the reason i have come to that conclusion is the print outs are also generating nullpointers so obiously im missing something tought id post incase anyone knew what im doing wrong