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Description of new and updated functions
Defining local communication ports for VoIP
Gigaset IP Phones / IM-BELG EN / A31008-xxxx-xxxx-x-xxxx / description.fm / 3/23/09
Version 4, 29.10.2007
Defining local communication ports for VoIP
This section replaces the section "Web configurator – Defining local communication ports for VoIP" in
the user guide for your Gigaset VoIP phone.
Specify which local communication ports (port numbers) the telephone is to use for VoIP
telephony. The ports must not be used by any other subscriber in the LAN.
The following communication ports are used for VoIP telephony:
u SIP port
Communication port via which the phone receives (SIP) signalling data
u RTP port
RTP ports are used to receive voice and control data. Three consecutive, even port num-
bers are required for each VoIP connection.
You define a fixed number for the SIP port and a fixed number range for the RTP port or set
your phone so that it uses free ports from a specified port number range (
£ Use random
ports).
¤ Open the following Web page: Settings ¢ Telephony ¢ Advanced Settings.
Area Listen ports for VoIP connections
Use random ports
¤ Click No if you want the phone to use the ports specified in the SIP port and RTP port
fields.
¤ Select Yes, if you do not want the phone to use fixed ports for SIP port and RTP port,
but rather to use any free ports from predefined ranges of port numbers.
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 divert incoming calls and voice data to one (the intended) phone.
Use random ports = No
SIP port
¤ Specify the port number for the SIP port. Enter a number between 1024 and 49152
in the field.
The default port number for SIP signalling is 5060.
The port number specified must not be in the RTP port number range.
RTP port
¤ Specify a range of port numbers that are to be used as RTP ports. This range must be
used in the LAN (router) for the phone.
¤ Enter the lowest port number in the left-hand field and the highest number in the
right-hand field (numbers between 1024 and 55000).
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