TY  - BOOK
AU  - Abrahams, John R.
AU  - Lollo, Mauro.
TI  - Centrex or PBX: the impact of IP 
SN  - 158053497X
AV  - TK5105.8865 A27 2003
U1  - 621.385 
PY  - 2003///
CY  - Boston
PB  - Artech House
KW  - Internet telephony
KW  - Centrex telephone service
N1  - Includes index
ER  -