Gigaset E380 A Care User Manual page 120

Questions and answers
Operation behind routers with network address translation
(NAT)
In general, no special telephone or router configuration is required when operating a Gigaset telephone with
NAT router. The configuration settings described in this section are only necessary if you encounter one of the
following problems.
•
No incoming calls are possible via VoIP. Calls to your VoIP phone numbers are not put through.
•
Outgoing calls via VoIP are not connected.
•
A connection is established with the other participant, but you cannot hear them and/or they cannot hear
you.
Changing the port numbers for SIP and RTP on your VoIP phone
The SIP and RTP port numbers may not be used by any other application or by any other host in the
LAN and should be completely different to the SIP and port numbers that are usually used (and pre-
set in the phone).
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Connect to the telephone's Web configurator using the PC web browser
Settings – Telephony – Advanced VoIP Settings
Example: Select port numbers that are similar to the standard settings:
SIP port 49060
RTP port 49004 to 49010
¥
Check new settings:
settings is displayed
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Test to see whether the original problem persists. If the problem does persist, carry out the next step.
Setting port forwarding on the router
Details for enabling a port on the router (example):
Protocol
for SIP UDP
for RTP UDP
Protocol The protocol used must be UDP.
Public port Port number/port number range on the WAN interface
Local port The SIP and RTP port numbers set on the phone
Local host (IP) Local IP address of your phone in the LAN
To enable the router to perform this port forwarding, the DHCP settings of the router must ensure that the
phone is always assigned the same local IP address.
120
Open website Settings – Telephony – Connections . . . the Status of the VoIP
Public port
49060
49004 – 49010
Change SIP and RTP port numbers
instead of 5060
instead of 5004 to 5010
Local port
49060
49004 – 49010
Register Open website
Save settings
Local host (IP)
192.168.2.10
192.168.2.10