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proxy is retained and the phone can therefore be reached. The repeat will be
carried out for all activated VoIP connections.
The default is 180 seconds.
If you enter 0 seconds, the registration will not be repeated periodically.
Area: Network data for your service provider
Please note
If you have downloaded the general settings for your VoIP provider from the
Gigaset configuration server
preset with the data from the download (e.g., the settings for the STUN server
and outbound proxy).
If your phone is connected to a router with NAT (Network Address Translation) and/
or a firewall, you must select some settings in this area so that your phone can be
reached from the Internet (i.e., can be addressed).
Through NAT, the IP addresses of subscribers in the LAN are concealed behind the
public IP address of the router.
For incoming calls
If port forwarding is activated or a DMZ is set up for the phone on the router, no
special settings are required for incoming calls.
If this is not the case, an entry in the NAT routing table (in the router) is necessary
in order for the phone to be reached. This entry is created when the phone is regis-
tered with the SIP service. In the interest of security, this entry is automatically
deleted at certain intervals (session timeout). The phone must therefore confirm its
registration at certain intervals (
stays in the routing table.
For outgoing calls
The phone needs its public address in order to receive caller voice data.
There are two possibilities:
u
The phone requests the public address from a STUN server on the Internet (Sim-
ple Transversal of UDP over NAT). STUN can only be used with asymmetric NATs
and non-blocking firewalls.
u
The phone does not direct the connection request to the SIP proxy but to an
outbound proxy on the Internet that supplies the data packets with the public
address.
The STUN server and outbound proxy are used alternately to work around the NAT/
firewall in the router.
STUN enabled
Select Yes if you want your phone to use STUN as soon as it is used on a router
with asymmetric NAT.
STUN server address
Enter the (fully-qualified) DNS name or the IP address of the STUN server on the
Internet (maximum 74 characters).
¢
(
page
24), then some fields in this area will be
£
NAT refresh time
on
page
28) so that the entry
27
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