Hersent O <br/><br/>
I P Telephony 

 - 0 
 - NULL  Pearson Education  2000 
 - 456 
<br/><br/><label>ISBN: </label>NULL 
<br/><br/><label>Subjects--Topical Terms: </label><br/>NULL
<br/><br/><label>Dewey Class. No.: </label>N.D.