TY  - BOOK
AU  - Hersent, Olivier.
AU  - Gurle, David.
AU  - Petit, Jean-Pierre.
TI  - IP Telephony: Packet-based multimedia communications systems 
SN  - 8178082586
U1  - 621.385 
PY  - 2000///
CY  - New Delhi
PB  - Pearson Education
N1  - This book having Appendix
ER  -