Sulkin, Allan
PBX systems for IP telephony / Allan Sulkin - New York, N.Y. : McGraw-Hill, c2002 - 487 p. : ill.
Includes index
0071375686
INTERNET TELEPHONY
TELEPHONE--PRIVATE BRANCH EXCHANGES
TK5105.8865 / S944P
PBX systems for IP telephony / Allan Sulkin - New York, N.Y. : McGraw-Hill, c2002 - 487 p. : ill.
Includes index
0071375686
INTERNET TELEPHONY
TELEPHONE--PRIVATE BRANCH EXCHANGES
TK5105.8865 / S944P