00991cam a22002895a 4500 12916936 20180404105840.0 020905t2002 nyua fr 001 0 eng d 0071375686 9780071375689 ATT ATT DLC EG-ScBUE eng 22 621.387 SUL Sulkin, Allan. PBX systems for IP telephony / Allan Sulkin. New York : McGraw-Hill, c.2002. viii, 487 p. : ill. ; 24 cm. McGraw-Hill telecom professional Index : p. 469-487. Donation from Mohanad Hszem Shalah. Internet telephony. BUEsh Telephone Private branch exchanges. BUEsh BUEsh GGEN April2018 Contributor biographical information http://www.loc.gov/catdir/bios/mh041/2002512119.html Table of contents http://www.loc.gov/catdir/toc/mh031/2002512119.html ddc 26461 26433 0 0 ddc 0 0 MAIN MAIN 1ST 2018-04-03 Donation 0 621.387 SUL 000047552 2025-07-15 00:00:00 BB