Siemens Gigaset C475 IP - Page 141

138
Web configurator – configuring the telephone via a PC
Configuring telephone connections
Gigaset C470-C475 IP / GBR / A31008-M1916-L101-1-7619 / web_server.fm / 7.2.08
Version 2.1, 08.01.2007
The STUN server and outbound proxy are used alternately to work around the NAT/firewall
in the router.
STUN enabled
Click Yes if you want your phone to use STUN as soon as it is used on a router with asym-
metric NAT.
STUN server
Enter the (fully-qualified) DNS name or the IP address of the STUN server on the Inter-
net.
If you selected Yes in the STUN enabled field, you must enter a STUN server here.
STUN port
Enter the number of the communication port on the STUN server. The default port is
3478.
STUN refresh time
Enter the time intervals at which the phone should repeat the registration with the
STUN server. The repeat is required so that the entry of the phone in the tables of the
STUN server is retained. The repeat will be carried out for all activated VoIP phone num-
bers.
Ask your VoIP provider for the STUN refresh time.
The default is 240 seconds.
If you enter 0 seconds, the registration will not be repeated periodically.
NAT refresh time
Specify the intervals at which you want the phone to update its entry in the NAT routing
table. Specify an interval in seconds that is a little smaller than the NAT session timeout.
As a rule you should not change the preconfigured value for the NAT refresh time.
Outbound proxy mode
Specify when the outbound proxy should be used.
Always
All signalling and voice data sent by the phone is sent to the outbound proxy.
Auto
Data sent by the phone is only sent to the outbound proxy when the phone is connected
to a router with symmetric NAT or blocking firewall. If the phone is behind an asymmet-
ric NAT, the STUN server is used.
If you have set STUN enabled = No or have not entered a STUN server, the outbound proxy
is always used.
Never
The outbound proxy is not used.
If you do not make an entry in the Outbound proxy field, the phone behaves independ-
ently of the selected mode, as with Never.
Outbound proxy
Enter the (fully qualified) DNS name or the IP address of your provider's outbound proxy.
Please note:
With many providers, the outbound proxy is identical to the SIP proxy.