BELGACOM Forum 523, Mounting And Commissioning Manual

Page: 131 / 244

VoIP System Telephones 129
Voice over IP (VoIP)
PC Port : Allows the telephone to be connected to a
workstation computer. Use a non cross-over RJ45 patch cable
to connect to the PC’s network port.
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The VoIP system telephone’s power supply is provided by an
extra plug-in power supply. It is also possible to provide a
power feed via PoE (“Power over Ethernet”). PoE requires
special devices for power feeds, as well as a completely wired
RJ45 connection line.
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You can also connect a standard headset via RJ45 sockets
(DHSG standard) to VoIP system telephones.
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VoIP system telephone’s audio signals are generated by the
telephone itself. DTMF dial tones and Music on Hold are
produced by the Media Gateway function.
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A VoIP system telephone can also be operated without a
permanent connection to the communications system, for
example via an on-demand RAS connection.
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Signalling data for call control, call data during three-way
conferences, connections to conventional terminals and
external connections is exchanged between the VoIP system
telephone and the communications system. During a call
between two VoIP system telephones, call data is exchanged
directly between the two VoIP system telephones.
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During the device’s start procedure, the IP address is
configured and the device software is requested via the DHCP
and TFTP network protocols.
VoIP System Telephone Configuration
The VoIP system telephones Forum IPhone 525 and
Forum IPhone 535 obtain the required IP address configuration
and operating software via the DHCP, BOOTP and TFTP IP proto-
cols. After the power supply is assured, the device’s internal boot
loader is started which controls the further start procedure.
Standard operating procedure is to contact the Forum 523/524’s
DHCP server so that the start procedure can be concluded without
problems. To register a new VoIP system telephone, proceed as
follows: