package javax.sip; import java.io.IOException; import java.text.ParseException; import javax.sip.header.ContactHeader; public interface ListeningPoint extends Cloneable { String TCP = "TCP"; String UDP = "UDP"; String SCTP = "SCTP"; String TLS = "TLS"; int PORT_5060 = 5060; int PORT_5061 = 5061; String getIPAddress(); int getPort(); String getTransport(); String getSentBy(); void setSentBy(String sentBy) throws ParseException; ContactHeader createContactHeader(); void sendHeartbeat(String s, int i) throws IOException; }