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Web configurator – setting the phone using a PC
Gigaset S675/S685 IP / GBR / A31008-xxxx-xxxx-x-xxxx / web_server.fm / 5/18/09
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8
Defining local communication ports for VoIP
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
Two consecutive RTP ports (consecutive port numbers) are required for each
VoIP connection. Voice data is received via one port and control data via the
other.
You can set port numbers or port number areas for SIP and RTP ports, or set
your telephone so that it can use any number of free ports from a predefined
range of port numbers.
¤
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 fields
SIP port
and
RTP port
.
Click
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 oper-
ated 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.
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 ).
Size of the port number range:
The difference between the port numbers must be at least
6
if you permit two
simultaneous VoIP calls on your phone. It must be at least
if you only permit
one VoIP call (
¢
option
).
The lower of the port numbers in the range (in the left-hand field) must be an
even
number. If you enter an odd number, the next lowest even number will
be selected automatically (e.g. if you enter 5003, then 5002 is set automati-
cally).
