NEC UNIVERGE SV9100 Manual page 81

router on the network where the handset belongs.
Port forwarding handset side
On the router connected to the handset network, forward port UDP/5060 to the IP address of the handset.
Also forward port UDP/3462 to the IP address of the handset.
If you have multiple NAT handsets on the same remote network you will need to change the port numbers
on each handset so that they are unique on the network. The first handset will be ok with default port
numbers.
You can change the port numbers in Network Settings/Advanced Settings/Self Port Settings – The SIP Port
can increment by one, recommend 5061, 5062 etc. The RTP ports must be an even number, recommend
3464, 3466 etc. The relevant port forwarding will then be required on the router on the handset network.
NetLink Considerations
When using NAPT in conjuction with NetLink the RTP/RTCP ports on the Primary and Secondary systems
must be unique (see table below for an example).
This is to facilitate the correct port forwarding in the NAT router when the RTP should be forwarded to the
Secondary VoIPU gateway rather than the Primary.
Index PRG
1 10-12-03
2 10-12-09
3 10-12-10
4 84-26-01
5 84-26-02
6 84-26-03
Primary Secondary
172.16.0.254 172.16.0.254
172.16.0.10 172.16.10.10
255.255.0.0 255.255.0.0
172.16.0.20 172.16.10.20
10020
10021
Part 2: VoIP Manual
LAN IP address of NAT router
IP address of GCD-CP10
Subnet mask of GCD-CP10
IP address of VoIPDB
20020 RTP port number of VoIPDB
20021 RTCP port number of VoIPDB
81
Remarks