示例:SIP Servlet SendOnServlet 类

SendOnServlet 类是一个简单的 SIP servlet,它将执行对每个 INVITE 调用的基本功能,并从该处发送请求。

SendOnServlet 类

可以方便地插入函数,以根据某个特定条件记录此 INVITE 请求或拒绝 INVITE。

package com.example;
import java.io.IOException;
import javax.servlet.sip.*;
import java.servlet.ServletException;
public class SendOnServlet extends SipServlet {
  public void doInvite(SipServletRequest req) 
       throws ServletException, java.io.IOException {
     //send on the request
     req.getProxy().proxyTo(req.getRequestURI);
  }
}

可以改变 doInvite 方法以进行特定操作,如根据特定条件直接拒绝 INVITE。在下面的示例中,从 example.com 外的域发出的所有请求都将被拒绝,并发出 Forbidden 响应。

public void doInvite(SipServletRequest req)
throws ServletException, java.io.IOException {
if (req.getFrom().getURI().isSipURI()){
	   SipURI uri = (SipURI)req.getFrom.getURI();
	   if (!uri.getHost().equals(“example.com”)) {
		//send forbidden response for calls outside domain
req.createResponse(SipServletResponse.SC_FORBIDDEN, “Calls outside example.com not accepted”).send();
return;
	   }
	}
	//proxy all other requests on to their original destination
	req.getProxy().proxyTo(req.getRequestURI());
   }


SendOnServlet deployment descriptor:
<sip-app>
    <display-name>Send-on Servlet</display-name>
    <servlet>
        <servlet-name>SendOnServlet</servlet-name>
        <servlet-class>com.example.SendOnServlet</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>SendOnServlet</servlet-name>
        <pattern>
              <equal>
                <var>request.method</var>
                <value>INVITE</value>
              </equal>
        </pattern>
    </servlet-mapping>
</sip-app>

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