TY  - BOOK
AU  - Johnston Alan B
AU  - Piscitello David M
TI  - Understanding voice over IP security
SN  - 1-59693-050-0
U1  - 005.8 
PY  - 2006///
CY  - Boston
PB  - Artech House
KW  - Internet telephony
KW  - Security measures
ER  -