PBX Systems for IP Telephony

PBX Systems for IP Telephony

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For example, a Siemens optiSet digital telephone equipped with two adapter modules can be connected concurrently to a second desktop optiSet digital telephone and a desktop analog telephone, with all three communications devices beinganbsp;...

Title:PBX Systems for IP Telephony
Author:Allan Sulkin
Publisher:McGraw-Hill Professional - 2002-04-24


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