:       
    

    

       

        :  "ISP"   
.             

          
  :   "TI"    
        

     (PHONE TO PHONE)     (PC TO PHONE)
.               

  (     ) VOICE   :   
             
           
             
.          

           :     
             
             
.   

  :          
           
           
.           

  "ISP"         :  
            
 ISP            .  
.        

             : 
               
          PSI  
.

  :         
             
             
           
.   

        "ISP"   
       :    
             
            
.         