Siemens Gigaset A580IP Manual page 129

Web configurator – Setting the phone using a PC
Area: Network
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 spe-
cial 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 (see
entry 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 out-
bound proxy on the Internet that supplies the data packets along with the pub-
lic 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
Enter the (fully-qualified) DNS name or the IP address of the STUN server on the
Internet (maximum 74 characters).
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.
128
£
Page 125), then some fields in this area will be
NAT refresh time,
£
Page 129), so that the