TY  - BOOK
AU  - Sara Azeem, Rahat Zehra & Talat Naz
TI  - IP Based PABX
U1  - 621.385072 AZE 
PY  - 2002///
CY  - Karachi
PB  - UIT
KW  - Computer System Engineering
KW  - Bachelor of Engineering (BE)
ER  -