WebRTC communication over Web Services

This post is about communication from any application to WebRTC using Web Services.

HTTP and XML is the basis for Web services

Advertisement Engine with WebRTC

WSDL
  • WSDL stands for Web Services Description Language
  • It specifies the location of the service and the operations (or methods) the service exposes.
  •  XML-based language for describing Web services.

SOAP
  • SOAP stands for Simple Object Access Protocol
  • SOAP is an XML based protocol for accessing Web Services.
  • SOAP is based on XML

UDDI
  • UDDI stands for Universal Description, Discovery and Integration
  • UDDI is a directory service where companies can search for Web services.
  • UDDI is described in WSDL
  • UDDI communicates via SOAP

RDF
  • RDF stands for Resource Description Framework
  • RDF is a framework for describing resources on the web
  • RDF is written in XML
uses :Web services can offer application-components like: currency conversion, weather reports, or even language translation as services.
…………..

OfficeSIP

This post describes the installation , setup and configuration of Office SIP server to provide a registrar to our SIP based WebRTC application .

1. Get office SIP from this website

officesip0

2. Downloaded office sip executable on windows looks like this . double click on it to start installation .

officesip1

3.Installation screen appears as follows

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4. Terms and conditions

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5. Destination folder for installation

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6. Installing

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7. Validating install

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8. Installation completed

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9. Launch icon on dekstop

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10 . Office SIP web login screen

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11. create account ( also known as realm or domain ) for users to register in their SIP and webrtc sip agents

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12. Fill in account details for every account added to officeSIP

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13. add users that will be registering to officeSIP server

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14.Office SIP settings file can be modified for changing server parameters like ip and port

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15 . Office SIP can now be used by sip agents like softphones , webRTC pages , etc to register with OfficeSIP server


BEA Weblogic SIP server

Bea server is a old SIP servlet container ie application server which is used to embed control logic in a program . It is supported on jdk1.5 hence the system’s environment variables must match . Otherwise in later stages deploying applications throw class version error .

1. Install Bea Weblogic

2. Follow the Installation steps

Make domain

3. Goto the installation directory . Usually C:/bea/user_projects/mydomain/ .

click on startweblogic.cmd in windows. In case the system is linux run startweblogic.sh script

4. Open Web console on url : http://127.0.0.1:7001/console. Enter username password

default username password weblogic , weblogic .

It can also be customized for example my username and password are altanai , tcs@1234

5.  Make Converged SIP Servlet Application in any editor such as notepad , edit+ etc .

The project structure looks like

Call screening
src
build
src
web
build.xml

The SIP servlet are put side directory structure of src

For example : sample application for Call screening

package com.altanai.voice;
import java.io.IOException;
import javax.servlet.*;
import javax.servlet.sip.*;
import javax.servlet.sip.Proxy;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.util.*;
public class CallScreening extends SipServlet
{
private static SipFactory factory;
private static SipApplicationSession sas;
private static Proxy proxy;
public void init(ServletConfig config) throws ServletException
{
System.out.println(“Call screening SIP servlet initiated”);
super.init(config);
}
protected void doInvite(SipServletRequest req) throws java.lang.IllegalArgumentException,java.lang.IllegalStateException,javax.servlet.ServletException,java.io.IOException
{
System.out.println(“Received an Invite Request”);
if(req.getFrom().toString().indexOf(“alice”)!=-1)
{
req.createResponse(406).send();
System.out.println(“User is blocked”);
}
else
{
req.createResponse(200).send();
System.out.println(“User is not blocked”);
}
}
}

6. Build it with ant . For this go inside the application folder and run ant. Output will either be “failed to build “ or “build successfully” .

The ant  command generates the war file from SIP servlet Web application .

7. Incase of successful build . Add the application to Weblogic web console install section and activate it .

I will demonstrate this process in step by step manner . First  click on “ Lock and Edit “ Button on the left panel . Then goto Install button in the centre area and browser to the location of application war or sar we have build through ant ,

8. We can delete an application in exactly the same way . click on “ Lock and Edit “ Button on the left panel . Then goto the delete button after selecting the radio button alongside the application we want to delete.

8. For enhanced application building we can also refer to sample provided along with bea weblogic . file:///C:/bea/sipserver30/samples/sipserver/examples/src/index.html