User Guide

144
FCC / ACTA Information
Gigaset A510IP / USA en / A31008-M2230-R301-2-6019 / appendix.fm / 09.10.2012
Version 4, 16.09.2005
Information on operating Gigaset VoIP telephones with routers
with Network Address Translation (NAT)
In general no special telephone or router configuration is required when operating
a Gigaset VoIP phone with 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 phone (
¢"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 phone's communi-
cation ports on the router (
¢"2. Setting port forwarding on the router",
page 145).
1. Changing the port numbers for SIP and RTP on your VoIP phone
On your VoIP phone, 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 must 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.