TY  - BOOK
AU  - Collier, Mark
TI  - Hacking exposed: unified communications & volp security secrets & solutions, 
SN  - 9780071798761
U1  - 005.8 
PY  - 2014///
CY  - New York
PB  - Mc Graw Hill education
KW  - Computer networks-Security measures
KW  - Computer science
ER  -