STUN server

Enter the (fully-qualified) DNS name or the IP address of the STUN server on the Internet.

If you selected the option 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 numbers.

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 asymmetric NAT, the STUN server is used.

Web configurator

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 independently 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.

Outbound proxy port

Enter the number of the communication port used by the outbound proxy.

The default port is 5060.

Saving settings on phone

¤Click on Set to save the changes.

The Connections list will be shown after saving (see Figure 3 on page 77).

If you want to reject the changes that have been made, click on Cancel. The Web page is re-loaded with the data saved on the phone.

Please note: If you do not make any entries for a lengthy period, the connection to the Web configurator is automatically terminated. Unsaved entries are lost. If necessary, implement temporary security measures. You can subsequently continue the entry and make changes if nec- essary.

Activating new connection

If you have configured a new VoIP connec- tion, you must also activate it.

In the Connections list:

¤Activate the relevant option in the Active column (½ = activated).

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