Froehlich, Andrew G. <br/><br/>
Cvoice 8.0 :  implementing cisco unified communications voice over ip and qos v8.0 study guide (642-437), with cd / 
Andrew Froehlich, Josh Haftel, Michael Bushong. 
 - Indianapolis, IN :  Wiley Pubishing, Inc.,  2011. 
 - xxxix,558 p. :  ill. ;  23 cm. 
<br/><br/> 'Exam 642-437'-- cover.  Includes index. 
<br/><br/><label>ISBN: </label>9780470916230 (pbk) 0470916230 (pbk ) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electronic data processing personnel--Certification.<br/>Internet telephony--Examinations--Study guides.<br/>Convergence (Telecommunication)--Examinations--Study guides.