Siemens Gigaset S675 IP Manual page 181

Area Listen ports for VoIP connections
Use random ports
Click No
and RTP
Click Yes
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
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 signaling is 5060.
The port number specified must not be in the
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. The difference must be at least 4 if you
only permit one VoIP call (
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 lower even number is
selected automatically (e.g. if you enter 5003, then 5002 is set automatically).
The default port number for voice transmission is 5004.
Use random ports
SIP port Enter the port number range from which the SIP port is to be selected.
Specify the lowest port number in the left-hand field and the highest number
in the right-hand field (number between 1024 and 49152).
This port number range must not overlap the range specified for
The default range is 5060 to 5076.
RTP port Specify a range of port numbers from which the RTP ports are to be selected.
Specify the lowest port number in the range in the left-hand field and the high-
est number in the right-hand field.
The default range is 5004 to 5020.
¤
Select
if you want the phone to use the ports specified in the fields
port.
if you do not want the phone to use fixed ports for
= No
¢
= Yes
to save your settings.
Set
RTP port
option Allow 1 VoIP call only
Setting the phone with the PC
SIP port
SIP port and
number range.
on Page 165).
RTP port.
RTP
179