User guide

206
Customer service & product warranty – Australia and New Zealand
Gigaset C610-C610A IP / AUS / A31008-M2312-C401-1-7619 / appendix.fm / 03.04.12
Version 4, 16.09.2005
Information on operating Gigaset VoIP telephones with
Network Address Translation (NAT) routers
In general no special telephone or router configuration is required when operating
a Gigaset VoIP phone with a NAT router. The configuration settings described in this
section are only necessary if you encounter one of the following problems.
Typical problems caused by NAT
u No incoming calls are possible via VoIP. Calls to your VoIP phone number are not
put through.
u Outgoing calls via VoIP are not connected.
u A connection is established with the other party, but you cannot hear them and/
or they cannot hear you.
Possible solution
1 Change the port numbers of the communication ports (SIP and RTP ports) on
your telephone (
£ "1. Changing the port numbers for SIP and RTP on your
VoIP phone").
2 In some cases, you must also define port forwarding for the telephone's commu-
nication ports on the router (
£ "2. Setting port forwarding on the router").
1. Changing the port numbers for SIP and RTP on your VoIP phone
On your VoIP telephone, define different (local) port numbers for the SIP and RTP
ports (between 1024 and 49152).
u These numbers must not be used by any other application or host in the LAN
and
u be considerably higher or lower than the SIP and RTP port numbers that you
usually use (and are preset on the phone).
This procedure is particularly useful if additional VoIP phones are connected to the
router.
To change the SIP and RTP port numbers on your VoIP phone, proceed
as follows:
¤ Connect your PC's browser to the Web configurator of the telephone and log in.
¤ Open the Web page Settings ¢ Te le ph ony ¢ Advanced VoIP Settings and
change the settings for the SIP and RTP ports (
¢ page 195).
To help you remember the new port numbers (e.g. for router configuration), you
can choose numbers that are very similar to the standard settings, e.g.
¤ Save the changes on your telephone.
¤ Wait for the active VoIP connections to be re-registered. To do so, switch to the
Web page Settings
¢ Teleph ony ¢ Connections to see the Status of your
VoIP connections.
¤ Check to see whether the problem persists. If it does, perform step 2.
SIP port 49060 instead of 5060
RTP port 49004 to 49010 instead of 5004 to 5010