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我需要使用 SIP servlet 实现下一个流程：

1）我的 SIP Servlet 应该捕获 INVITE 消息 2）查看 SIP TO 标头，如果它与某种模式匹配，我需要返回 REFER 消息。

我用谷歌搜索，找到了这本手册（Basic Transfer）：www.dialogic.com/webhelp/IMG1010/10.5.1/WebHelp/sip_rfr_calltrans.htm

正如我正确理解的那样，此流程如下所示：1）用户A向SIP App发送INVITE消息2）SIP App应该发回200 OK 3）UserA发送ACK消息4）SIP App向UserA发送REFER消息5）UserA应该发回202Accepted 并且 than NOTIFY

我的环境：

1) mss-2.0.0.FINAL-jboss-as-7.1.2.Final 作为 SIP 代理服务器 127.0.0.1:5080

2) user3@127.0.0.1:5060 --- MicroSIP ( http://www.microsip.org/ )

3) user2@127.0.0.1:5090 --- Zoiper_Free_2.41

DAR 文件：

邀请:("org.call.forwarding.CallForward","DAR:From","ORIGINATING","","NO_ROUTE", "0")

注册：（“org.call.forwarding.CallForward”，“DAR：From”，“ORIGINATING”，“”，“NO_ROUTE”，“0”）

SUBSCRIBE:("org.call.forwarding.CallForward","DAR:From","ORIGINATING","","NO_ROUTE", "0")

选项：（“org.call.forwarding.CallForward”，“DAR：From”，“ORIGINATING”，“”，“NO_ROUTE”，“0”）

NOTIFY:("org.call.forwarding.CallForward", "DAR:From", "ORIGINATING", "", "NO_ROUTE", "0")

REFER:("org.call.forwarding.CallForward", "DAR:From", "ORIGINATING", "", "NO_ROUTE", "0")

从 user3@127.0.0.1 我打电话给拒绝者@127.0.0.1

所以我的源代码如下所示： 1）捕获 INVITE 包并做出 200 OK 响应：

@Override
protected void doInvite(SipServletRequest request) throws Exception {
    // Pattern match logic ommited       
    SipServletResponse response = request.createResponse(SipServletResponse.SC_OK);
    String str = response.toString();
    response.send()
}

INVITE sip:refuser@127.0.0.1:5080 SIP/2.0
Via: SIP/2.0/UDP 192.168.0.17:5060;rport=5060;branch=z9hG4bKPjb1570e34df4c442093af6fb2fa238667;received=127.0.0.1
Max-Forwards: 70
From: "user3" <sip:user3@127.0.0.1>;tag=87be8901c4e242fbb5c696d90d0ec068
To: <sip:refuser@127.0.0.1>
Contact: "user3" <sip:user3@127.0.0.1:5060;ob>
Call-ID: 983d9572c4a541d49566699b3edec1e0
CSeq: 22256 INVITE
Allow: PRACK,INVITE,ACK,BYE,CANCEL,UPDATE,INFO,SUBSCRIBE,NOTIFY,REFER,MESSAGE,OPTIONS
Supported: replaces,100rel,timer,norefersub
Session-Expires: 1800
Min-SE: 90
User-Agent: MicroSIP/3.3.21
Content-Type: application/sdp
Content-Length: 673

我的回复：200 OK 回复如下：

SIP/2.0 200 OK
To: <sip:refuser@127.0.0.1>;tag=25395207_da1be872_8479416b-da5c-4dca-baef-f9b7db279b9e
Via: SIP/2.0/UDP 192.168.0.17:5060;rport=5060;branch=z9hG4bKPjb1570e34df4c442093af6fb2fa238667;received=127.0.0.1
CSeq: 22256 INVITE
Call-ID: 983d9572c4a541d49566699b3edec1e0
From: "user3" <sip:user3@127.0.0.1>;tag=87be8901c4e242fbb5c696d90d0ec068
Contact: <sip:127.0.0.1:5080>
Content-Length: 0

然后我尝试处理 ACK 包并生成 REFER 包：

@Override
protected void doAck(SipServletRequest request) throws ServletException, IOException {          
    String ack = request.toString();
    logger.info("Got ASK!!!: " + request.toString());
    SipFactory sipFactory = (SipFactory) getServletContext().getAttribute(SIP_FACTORY);        
    SipApplicationSession appSession = request.getApplicationSession();
    SipServletRequest refer = sipFactory.createRequest(appSession, "REFER",
                                                         sipFactory.createURI("sip:user@127.0.0.1:5080"), // from                                            sipFactory.createURI("sip:user2@127.0.0.1:5090")); // to
    refer.addHeader("Refer-To", "sip:user3@127.0.0.1:5080");
    refer.addHeader("Referred-By", "sip:user@127.0.0.1:5080");
    logger.info("!!!!!!!!!!!THIS IS REFER: \n" + refer.toString());
    String strRefer = refer.toString();
    refer.send();               
} 

ACK sip:127.0.0.1:5080 SIP/2.0
Via: SIP/2.0/UDP 192.168.0.17:5060;rport=5060;branch=z9hG4bKPje03842cfb4104d379db989f2d77a871a;received=127.0.0.1
Max-Forwards: 70
From: "user3" <sip:user3@127.0.0.1>;tag=87be8901c4e242fbb5c696d90d0ec068
To: <sip:refuser@127.0.0.1>;tag=25395207_da1be872_8479416b-da5c-4dca-baef-f9b7db279b9e
Call-ID: 983d9572c4a541d49566699b3edec1e0
CSeq: 22256 ACK
Content-Length: 0

还有我的 REFER 包：

REFER sip:user2@127.0.0.1:5090 SIP/2.0
Call-ID: ca002d9261fe165c0a4eaedc99ead2c7@127.0.0.1
CSeq: 1 REFER
From: <sip:user@127.0.0.1:5080>;tag=14387494_da1be872_8479416b-da5c-4dca-baef-f9b7db279b9e
To: <sip:user2@127.0.0.1:5090>
Max-Forwards: 70
Contact: <sip:user@127.0.0.1:5080>
Refer-To: <sip:user3@127.0.0.1:5080>
Referred-By: <sip:user@127.0.0.1:5080>
Content-Length: 0

然后我在日志文件中看到 TRYING 消息：

SIP/2.0 100 Trying
Via: SIP/2.0/UDP 127.0.0.1:5080;branch=z9hG4bK8479416b-da5c-4dca-baef-    f9b7db279b9e_da1be872_1872624593941
To: <sip:user2@127.0.0.1:5090>
From: <sip:user@127.0.0.1:5080>;tag=14387494_da1be872_8479416b-da5c-4dca-baef-f9b7db279b9e
Call-ID: ca002d9261fe165c0a4eaedc99ead2c7@127.0.0.1
CSeq: 1 REFER
Content-Length: 0

大约 30 秒后，我看到 Microsip 显示“不可接受”消息：

SIP/2.0 408 Request timeout
To: <sip:user2@127.0.0.1:5090>;tag=37903989_da1be872_8479416b-da5c-4dca-baef-f9b7db279b9e
Via: SIP/2.0/UDP 127.0.0.1:5080;branch=z9hG4bK8479416b-da5c-4dca-baef-f9b7db279b9e_da1be872_1872624593941
CSeq: 1 REFER
Call-ID: ca002d9261fe165c0a4eaedc99ead2c7@127.0.0.1
From: <sip:user@127.0.0.1:5080>;tag=14387494_da1be872_8479416b-da5c-4dca-baef-f9b7db279b9e
Contact: <sip:127.0.0.1:5080>
Content-Length: 0

任何人都可以解释一下：这家伙怎么了？？？还有一点让我大吃一惊：在某些情况下，在发送 200 OK 消息后（当我处理 INVITE 时），我会在 ACK 之前立即收到 BYE 消息……为什么会这样？

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1 回答 1

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在您的 REFER 标头中，您的 Contact 和 CallID 似乎没有与您的原始 ACK 和 200OK 消息链接。这就是为什么你最终会得到 100 Trying 的原因，因为没有等待任何类型的响应的未完成消息。

于 2013-10-31T02:38:07.217 回答