Gigaset S675 IP User Manual page 30

Description of new and updated functions
Information on operating Gigaset VoIP telephones with Network Address Translation (NAT) routers
2. Setting port forwarding on the router
To ensure that your specified SIP and RTP port numbers are used on the WAN interface with
the public IP address, you must define port forwarding rules for the SIP and RTP ports on
the router.
To define port forwarding on the router, proceed as follows:
The terms used in the following can vary from router to router.
To forward a port, you must make the following specifications (example):
Protocol Public port
UDP 49060
UDP 49004–49010
Protocol
Enter UPD as the protocol to be used.
Public port
Port number/port number range on the WAN interface
Local port
The SIP and RTP port numbers set on the telephone.
In the new firmware version for Gigaset VoIP telephones, you can set a RTP port range.
In this case, you must also define corresponding port forwarding for this range.
Local host (IP)
Local IP address of your phone in the LAN. You can see the phone's current IP address in
the handset display by pressing the paging key on the base.
To enable the router to perform this port forwarding, the DHCP settings of the router must
ensure that the telephone is always assigned the same local IP address – i.e. the DHCP does
not change the IP address assigned to the telephone during operation. Alternatively,
you can assign a fixed (static) IP address to the telephone (
However, you must ensure that this IP address is not within the address range reserved for
DHCP and is not assigned to any other LAN subscriber.
30
Local port
49060
49004–49010
Local host (IP)
192.168.2.10
192.168.2.10
£
user guide for your phone).
for SIP
for RTP