June 2004
Intermediate to advanced
408 pages
12h 6m
English
book
THE ROAD TO IP TELEPHONY: HOW CISCO SYSTEMS MIGRATED FROM PBX TO IP TELEPHONY
by Stephanie L. Carhee
Content preview from THE ROAD TO IP TELEPHONY: HOW CISCO SYSTEMS MIGRATED FROM PBX TO IP TELEPHONY
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The Road to IP Telephony
(154)
Security
In some instances—such as lobby phones and other public access areas—the team needed
to provide IP phone service but was restricted to voice-only to prevent unauthorized access
to the desktop network. The IP phone is designed so that a computer can be connected to
it, allowing the computer to access the network as well. The voice-only restriction was
accomplished by allowing only the voice VLAN to be active on the CAT 6500 port to which
the IP phone was connected.
“This was simple to do because auxiliary VLANs were used to carry voice traffic,” Molyski
recalls. As a result, any PC that was connected to that ...
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