137
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
Ve
rs
ion 2.
1,
08.0
1.20
07
Registrar server
Enter the (fully-qualified) DNS name or the IP address of the registrar server.
The registrar is needed when the phone is registered. It assigns the public IP address/
port number to your SIP address (
Username@Domain
) that were used by the phone at reg-
istration. With most VoIP providers, the registrar server is identical to the SIP server.
Example:
reg.myprovider.com.
Registrar server port
Enter the communication port used in the registrar. It is mainly port 5060 that is used.
Registration refresh time
Enter the time intervals at which the phone should repeat the registration with the VoIP
server (SIP proxy) (a request will be sent to establish a session). The repeat is required
so that the entry of the phone in the tables of the SIP proxy is retained and the phone
can therefore be reached. The repeat will be carried out for all activated VoIP phone
numbers.
The default is 180 seconds.
If you enter 0 seconds, the registration will not be repeated periodically.
Area:
Network
If your phone is connected to a router with NAT (Network Address Translation) and/or a fire-
wall, you must make 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 registered 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
NAT refresh time
, page 138), so that the 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 (Simple
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 along with the public address.
Please note:
If you have downloaded the general settings for your VoIP provider from the Siemens configuration
server (page 133), then some fields in this area will be preset with the data from the download (e.g.
the settings for the STUN server and outbound proxy).
