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Defining local communication ports for VoIP
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Open the following Web page:
In the
Listen Ports for VoIP Connections
for VoIP telephony. The ports must not be used by any other subscriber in the LAN.
SIP port
Specify the local communication port that the phone should use to send and receive sig-
nalling data. Specify a number between 1024 and 49152.
The default port number for SIP signalling is 5060.
The recommended value is between 5056 and 5071.
RTP port
Specify the local communication port that the phone should use to send and receive
voice data. Enter an even number between 1024 and 49152. The port number must
not match the port number in the
number just below it will be set (e.g. if you enter 5003, 5002 is set).
The default port number for SIP signalling is 5004.
Use random ports
Click the
option if you do not want the phone to use fixed ports for
Yes
port, but rather to use any free ports.
The use of random ports makes sense if you want several phones to be operated on the
base station router. The phones must then use different ports so that the router's NAT
is only able to forward incoming calls and voice data to one (the intended) phone.
If you click No, the phone will use the ports specified in
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Now click
Set
to save your settings.
102
Defining local communication ports for VoIP
¢
Settings
Telephony
area, specify which local ports the telephone is to use
field. If you enter an odd number, the even
SIP port
¢
Advanced
Settings.
SIP port
SIP port
and
RTP
and
RTP
port.
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