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If you selected the Yes option in the STUN enabled field, you must enter a STUN
server.
STUN server 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 acti-
vated VoIP connections.
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 shorter than the NAT
session timeout.
As a rule you should not need to 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.
Automatic
Data sent by the phone is only sent to the outbound proxy when the phone is
connected to a router with symmetric NAT or a blocking firewall. If the phone is
behind an asymmetric NAT, the STUN server is used.
If you have set STUN enabled = No or have not entered a STUN server, the out-
bound proxy is always used.
Never
The outbound proxy is not used.
If you do not make an entry in the Outbound server address field, the phone
behaves independently of the selected mode, as with Never.
Outbound server address
Enter the (fully qualified) DNS name or the IP address of your provider's out-
bound proxy (maximum 74 characters).
With many providers, the outbound proxy is identical to the SIP proxy.
Outbound proxy port
Enter the number of the communication port used by the outbound proxy.
The default port is 5060.
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Please note
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