TY  - BOOK
AU  - Dang, Luan Gennings, Cullen etal 
TI  - Practicle VOIP : Using VOCAL 
SN  - 81-7366-439-0 
U1  - 004.62 DAN  
PY  - 2002///
CY  - SPD pvt. Ltd. 
PB  - Mumbai 
KW  - COMPUTER NETWORK
ER  -