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Question

我准备了如下要求：

REGISTER sip:xxx.xxx.xxx.xxx SIP/2.0
Call-ID: cb3a691495487eabc2ca2a5ea1799a7a@192.168.174.1
CSeq: 1 REGISTER
From: <sip:Santanu@xxx.xxx.xxx.xxx>;tag=textclientv1.0
To: <sip:Santanu@xxx.xxx.xxx.xxx>
Max-Forwards: 70
Via: SIP/2.0/TCP 192.168.174.1:5060
Contact: <sip:Santanu@192.168.174.1;transport=tcp>
Content-Length: 0

在

inviteTid = sipProvider.getNewClientTransaction(request);

我收到空异常。

我的代码如下：

public void register() throws NullPointerException{

Object logger;
try {

cseq++;
ArrayList<ViaHeader> viaHeaders = new ArrayList<ViaHeader>();
ViaHeader viaHeader = this.headerFactory.createViaHeader(this.ip,
this.port, "tcp", null);
viaHeaders.add(viaHeader);
// The "Max-Forwards" header.
MaxForwardsHeader maxForwardsHeader = this.headerFactory
.createMaxForwardsHeader(70);
// The "Call-Id" header.
CallIdHeader callIdHeader = this.sipProvider.getNewCallId();
// The "CSeq" header.
@SuppressWarnings("deprecation")
CSeqHeader cSeqHeader = this.headerFactory.createCSeqHeader(cseq,
"REGISTER");

Address fromAddress = addressFactory.createAddress("sip:"
+ username1 + '@' + server);

FromHeader fromHeader = this.headerFactory.createFromHeader(
fromAddress, "textclientv1.0");//String.valueOf(this.tag)//Integer.toString(hashCode())
// The "To" header.
ToHeader toHeader = this.headerFactory.createToHeader(fromAddress,
null);

// this.contactHeader = this.headerFactory
// .createContactHeader(contactAddress);

request = this.messageFactory.createRequest("REGISTER sip:"
+ server + " SIP/2.0\r\n\r\n");
request.addHeader(callIdHeader);
request.addHeader(cSeqHeader);
request.addHeader(fromHeader);
request.addHeader(toHeader);
request.addHeader(maxForwardsHeader);
request.addHeader(viaHeader);
request.addHeader(contactHeader);
//Response response=this.messageFactory.createResponse(200, request);

if (resp != null) {
boolean retry = true;
AuthorizationHeader authHeader = Utils.makeAuthHeader(headerFactory, resp,
request, username1, password);
request.addHeader(authHeader);
}
System.out.println(""+ request);
inviteTid = sipProvider.getNewClientTransaction(request);
// send the request out.
inviteTid.sendRequest();
this.dialog = inviteTid.getDialog();
// Send the request statelessly through the SIP provider.
//                  this.sipProvider.sendRequest(request);

// Display the message in the text area.
//debug("Request sent:\n" + request.toString() + "\n\n");
} catch (Exception e) {
// If an error occurred, display the error.
e.printStackTrace();
//debug("Request sent failed: " + e.getMessage() + "\n");
}
}

Answer 1

这是一种非常不寻常的创建请求的方式。我的猜测是你有“\r\n\r\n”，它创建一个空行来终止对 SIP 消息的解析。但是这种创建消息的方式无论如何都不好，您应该让构造函数完成其工作，以使用协议详细信息和经过验证的 URI 进行适当的空格和格式设置。

我建议你看看这个例子https://github.com/usnistgov/jsip/blob/master/src/examples/simplecallsetup/Shootist.java#L318

否则请post这里的标准输出和调试日志。

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