Siemens Gigaset C450IP 사용자 설명서

Gigaset C450 IP / Greek eng / A31008-M1713-T151-3-8U19 / web_server.fm / 24.9.07

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on 4, 16.

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, page 60), 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 asymmet-

ric NATs and non-blocking firewalls. 

u The phone does not direct the connec-

tion request to the SIP proxy but to an 

outbound proxy on the Internet that 

supplies the data packets along with 

the public address. 

The STUN server and outbound proxy are 

used alternately to work around the NAT/

firewall in the router. 

Click on 

 if you want your phone to 

use STUN as soon as it is used on a 

router with asymmetric NAT.

Enter the (fully-qualified) DNS name or 

the IP address of the STUN server on 

the Internet. 
If you selected the option 

 in the 

 field, you must enter a 

 here. 

Enter the number of the communica-

tion port on the STUN server. The 

default port is 3478. 

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 
Ask your VoIP provider for the 

.

The default is 240 seconds. 
If you enter 0 seconds, the registration 

will not be repeated periodically. 

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 

. 

Specify when the outbound proxy 

should be used.

 

All signalling and voice data sent by the 

phone is sent to the outbound proxy. 

 

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 

phone is behind an asymmetric NAT, 

the STUN server is used. 
If you have set 

 = 

 or 

have not entered a STUN server, the 

outbound proxy is always used. 

 

The outbound proxy is not used. 
If you do not make an entry in the 

 field, the phone behaves 

independently of the selected mode, 

just as with 

. 

Enter the (fully qualified) DNS name or 

the IP address of your provider's out-

bound proxy. 

Enter the number of the communica-

tion port used by the outbound proxy. 

The default port is 5060. 

With many providers, the outbound proxy is 

identical to the SIP proxy.