Sinnreich, Henry.  <br/><br/>
Internet Communications Using SIP :   Delivering VoIP and Multimedia Services with Session Initiation Protocol /  
Sinnreich Henry, Johnston Alan B.. 
 - New York :   Wiley & Sons,   2001. 
 - XX, 298 s.:   il.;   24 cm. 
<br/><br/><label>ISBN: </label>0471413992