SIP enabled EJB running in Glassfish again

Description of the project: Create an EJB in Glassfish that can register to a SIP server and receive a call invite from any number. The SIPprovider is www.cellip.com. The EJB shall then send an "busy" response. The calling part phone number shall be logged in the Glassfish log. If many phones calls the EJB at the same time, they all shall get a "busy" response and all phone numbers shall be logged. You can use any available SIP stack. Free or commercial any are ok. This is a fixed price project and you need to specify how much money you want to do this project. Project specifications: 1. Project developed in Netbeans. 2. Complete source code in delivery 3. EJB project that can be deployed and run in Glassfish 4.1 4. Project contains all necessary SIP libs 5. The EJB is a singleton bean. 6. The EJB register to cellip and waiting for calls(invite). When a call is received, it replies "Busy" and ends the call and stores the calling number in the Glassfish logfile. Then the EJB starts waiting for a new call. 7. JDK 1.8