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Voice over IP (VoIP) VoIP System Telephones
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6. The VoIP system telephone creates a second TCP connection using the sig-
nalling port number 8101 and sends a registration analogue to the U
pn
system
telephones.
7. Extra connections are created using the IP protocol RTP (“Realtime Transport
Protocol”) for call data when a call is created. For calls between two VoIP system
telephones, port numbers above 8200 are used. For transmission to a Media
Gateway channel, a port in the range 1024 – 1087 is used.
If you wish to operate a VoIP system telephone via a routed IP connection (for
example VPN or RAS) it may be necessary to configure an external DHCP server
accordingly. Please note the selection of the codec and keep-alive time for such
connections. The operations software provided via TFTP must match the type of
device and communications system. You may also need to configure BOOTP, DHCP
and TFTP servers for the VoIP system telephone.
7.4.5 Local Configuration
In addition to automatic configuration via BOOTP/DHCP, it is possible to manually
configure an Aastra 6773ip (OpenPhone 73 IP) or an Aastra 6775ip
(OpenPhone 75 IP). This can make sense, for example, when you wish to connect a
VoIP system telephone at a distant location via router. This local configuration is
saved permanently in the non-volatile memory of the VoIP system telephone. To
change the local configuration, use an additional program, the Java-based “IP
Phone Configurator”.
Note: Java programs can be run on all common operating
systems. To execute Java-based programs, you must install a
suitable Java runtime environment on your operating sys-
tem (JRE). This can be downloaded under the following web
address: http://www.java.com/.