TY  - BOOK
AU  - Collins, Daniel
TI  - Carrier Grade Voice Over IP 
SN  - 0071231552
U1  - 621.38212 
PY  - 2003///
CY  - Boston : 
PB  - McGraw-Hill, 
KW  - Computer Networks
KW  - Telecommunications
N1  - YY
UR  - https://eaklibrary.neduet.edu.pk:8443/catalog/bk/books/toc/0-07-123155-2.pdf
ER  -