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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.
RTP port
Specify the local communication port that the phone should use to receive voice data.
Enter an even number between 1024 and 49152. The port number must not be the
same as the port number in the
est even number will be selected automatically (e.g. you enter 5003, then 5002 is set
automatically). The default port number for voice transmission is 5004.
Use random ports
Click
if you do not want the phone to use fixed ports for
Yes
rather to use any free ports.
The use of random ports makes sense if you want several phones to be operated on the
same router with NAT. 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
¤
Now click
to save your settings.
Set
Configuring call forwarding via VoIP
If you are toggling calls via VoIP connections, you can connect the two external callers (pro-
vider-dependent). You can configure settings for this type of call forwarding.
¤
Open the following Web page:
¤
Configure the following settings in the
Transfer Call by On-Hook
If you activate Yes, the external parties you are toggling between will be connected
when you press the end call key a. Your connections with the parties will be termi-
nated.
To learn how to forward a call when you have activated
Preferred Refer To
Define the protocol (the contents of the "Refer To" information) that should be used with
preference when forwarding calls:
Target's contact info
This protocol is recommended for "closed" networks (internal company and business
networks).
Original URL
This protocol is recommended when the base station is connected to the Internet via a
router with NAT.
Web configurator – configuring the telephone via a PC
¢
Settings
Telephony
area, specify which local ports the telephone is to use
field. If you enter an odd number, the next low-
SIP port
¢
Settings
Telephony
Call Transfer
Defining local communication ports for VoIP
¢
Advanced
Settings.
and
SIP port
SIP port
and
RTP
¢
Advanced
Settings.
area for call forwarding via VoIP:
please see page 47.
No,
port, but
RTP
port.
137
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