Re: about stun4j in jain-sip 1.2

hi,

i do have the following doubt, pls help!

1) when should I start running  stun4j  ?
it seems that I must start stun4j before [Step 2] :
Line: udpListeningPoint = sipStack.createListeningPoint(PRIVATE_IP, 
PRIVATE_PORT,transport);
bcos, this line will bind the address (e.g. 10.0.0.1:5060). stun4j will 
not able to bind the same address (10.0.0.1:5060) after this line!!


2) when should I stop running stun4j ?

i must explicitly call addressDiscovery.shutDown();  before [Step 2] , 
otherwise sipstack will fail to bind address & throw exception at [Step 
2]

3) is my implementation  correct?
[1st UDP session at NAT]
-> run stun4j
-> detect public address
-> shutdown stun4j
[2nd UDP session at NAT]
-> createListeningPoint via sipstack
-> set Via & contact address
-> send request

now, i have problem on re-running stun4j multiple times for KeepAlive. 
how should I do it in jain-sip?

btw, i also checked sip-communicator (in both old and new1.0 version). 
i could not find any actual integration of stun4j beside using stun4j 
as a diagnostic tool for debugging.
did i miss anything? pls advise on any example and tutorial guide on 
this area. anyone has a good example? can share with me?

~manchi

-----------------------------------------------------------
for stun4j with jain-sip 1.2, I did the following:
-----------------------------------------------------------
//
//  create a method to use stun4j API
//
private void setPublicAddress() {

		StunAddress localAddr =  new 
StunAddress(InetAddress.getLocalHost(),PRIVATE_IP);

		StunAddress serverAddr  serverAddr = new StunAddress(STUN_SERVER_IP, 
STUN_SERVER_PORT);
		NetworkConfigurationDiscoveryProcess addressDiscovery = new 
NetworkConfigurationDiscoveryProcess(
				localAddr, serverAddr);

		addressDiscovery.start();

		StunDiscoveryReport stunReport stunReport = 
addressDiscovery.determineAddress();
		
		StunAddress stunAddress = stunReport.getPublicAddress();
		
		//
		// overwrite class field for PUBLIC_IP and PUBLC_PORT with public 
address detected from stun4j
		//		
		this.PUBLIC_IP = stunAddress.getHostAddress();
		this.PUBLIC_PORT = stunAddress.getPort();

		// need to shutdown stun process, otherwise, stun4j is holding port
		addressDiscovery.shutDown();
	}

public void sendRegister() {
	//
	// [ Step 1 ]  run setPublicAddress() to set PUBLIC_IP & PUBLIC_PORT 
with stun4j
	//
	this.setPublicAddress();
	....

	//
	// [  Step 2 ] to avoid verfiication check by sip-stack-imp,
	// create listening point with private address first,
	// then use setSentBy to replace with public address.
	//
	udpListeningPoint = sipStack.createListeningPoint(PRIVATE_IP, 
PRIVATE_PORT,transport);
	udpListeningPoint.setSentBy(PUBLIC_IP + ":" + PUBLIC_PORT);

	//
	// [  Step 3 ] create  ViaHeaders with public address
	//	
	ArrayList viaHeaders = new ArrayList();
	ViaHeader viaHeader = 
headerFactory.createViaHeader(PUBLIC_IP,PUBLIC_PORT, transport, null);
	viaHeaders.add(viaHeader);

	//
	// [ Step 4 ] Create and add the contact name address
	// with public address		
	//		
	SipURI contactURI = addressFactory.createSipURI(fromUserName,PUBLIC_IP);
	contactURI.setPort(PUBLIC_PORT);
	Address contactAddress = addressFactory.createAddress(contactURI);
	contactAddress.setDisplayName(fromUserName);
	ContactHeader contactHeader = 
headerFactory.createContactHeader(contactAddress);
	request.addHeader(contactHeader);

	...
	clientTransaction.sendRequest();
	....
}


On 2006-06-13 19:44:11 +0800, "M. Rangnathan" <[email protected]> said:

> Man-Chi Leung wrote:
> 
>> hi,
>> 
>> ----------------------------------------------
>> in jain-sip 1.1 CVS source,
>> ----------------------------------------------
>> I found info about stun4j in /docs/faq.html
>> 
>> How do you enable/use the STUN support?
>> set the gov.nist.javax.sip.STUN_SERVER to point to 
>> stun_server_ip_address[:port] where your stun server resides. The stack 
>> will return mapped address when you getIpAddress() from the stack and 
>> getPort() from the listening point. With stun, if you have a NAT box, 
>> these will in general be different from the IP address and port used to 
>> create the LP. Your application needs to use these in setting up the 
>> contact address and SDP parameters as appropriate. The stack is not 
>> responsible for this.
>> 
>> 
>> ----------------------------------------------
>> in jain-sip 1.2 CVS source
>> ----------------------------------------------
>> i found the following snippet in Class "gov.nist.javax.sip.SIPStackImpl.java"
>> 
>>         String stunAddr = configurationProperties
>>                 .getProperty("gov.nist.javax.sip.STUN_SERVER");
>> 
>>         if ( stunAddr != null )
>>             this.logWriter.logWarning("Ignoring obsolete property "
>>                 + "gov.nist.javax.sip.STUN_SERVER");
>> 
>> -----------------------
>> my Question:
>> -----------------------
>> is stun4j totally ignored by jain-sip 1.2 ?
> 
> 
> Totally and absolutely ignored. :-) Stun was never part of JAIN-SIP. 
> The previous version had some Stun support in the RI. It was deemed 
> unecessary and therefore removed.
> 
>> 
>> 
>> so idea is to just call Stun's API from my jain-sip client, am i correct?
>> - get public address from Stun4j's  addressDiscovery.determineAddress();
>> - set public address in Via using API Jain-SIP's  
>> headerFactory.createViaHeader()
> 
> 
> Set the sentBy on your Listening point. See ListeningPoint.setSentBy()
> Set the public address in Via.
> 
> If you dont do the former,  the RI will throw an exception. It does a 
> little integrity check.
> 
> This may not be relevant to you but there is now an AddressResolver 
> (only part of the RI and not the spec).  When the reciever gets a 
> message it checks the via header to see if it can resolve the address. 
> To do this it uses the AddressResolver. If the address cannot be 
> resolved the message is dropped. Just a little security and integrity 
> feature that I thought people might find useful. Also a way to deal 
> with DNS SRV record lookups that the stack does not implement ( you can 
> implement this Interface and register with the stack).
> 
>> - set public address in Contact using API Jain-SIP's  
>> addressFactory.createAddress(contactURI);
> 
> Yes
> 
>> - set public address and port for  SDP c=  attribute.
> 
> 
> Yes.
> 
>> 
>> ~manchi
>> 
>> 
>> 
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