Johnston, Alan B. <br/><br/>
SIP :  understanding the session initiation protocol / 
Alan B. Johnston 
 - 2nd ed. 
 - Boston :  Artech House,  2004 
 - xxiii, 283 p. :  ill. ;  24 cm 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>1580536557 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer network protocols