agent.java

First of all, the Applet-phone is a SIP User-Agent with audio and text messaging capabilities. But

package gov.nist.examples.pcc;

public class Agent {
    
    public String userName;
    public String hostName;
    public String identifier;
    
    public Agent() {

    }
    
    public Agent(String userName,String hostName) {
        this.userName=userName;
        this.hostName=hostName;
    }
    
    public Agent(String sipURI){
       userName=sipURI.substring(4,sipURI.indexOf("@"));
       hostName=sipURI.substring(sipURI.indexOf("@")+1,sipURI.length());
       System.out.print("Agent : "+userName+" ");
       System.out.println(hostName);
    }
    
    public String getSipURI() {
        return "sip:"+userName+"@"+hostName;
    }
    
}