Table 1-34 Example - System Setting; Figure 1-23 Example- Nat Traversal - NEC SL2100 Features And Specifications Manual

SL2100
• NAT Traversal
The NAPT (Network Address Port Translation) feature gives the SL2100 the ability to "traverse" its
own subnet. With NAPT used in the SL2100, the network administrator can place the CPU and the
VoIPDB in the customers LAN while still making it accessible to users outside the local LAN.
• Static NAT
This method is used to convert an address (a WAN-side address for the NAT router) previously
specified in the terminal configuration. For this method, a conversion table is statically set up for the
NAT router, and then a packet for a specific port is transferred to a specific terminal by using the port
forwarding function of the NAT router.
• Dynamic NAT
This method is used to automatically acquire the WAN-side global address for the NAT router and
convert it.
NAT Traversal
I
Besides ordinary NAPT feature SL2100 supports NAT Traversal which does not require Port
Forwarding setting at remote side router. This feature is effective when PRG 15-05-45 is set "1" (On).
Example of NAT Traversal network and necessary settings for System and IP Terminal are shown in
below Figure 1-23 Example- NAT Traversal on page
page 1-484 and
Actual input data should be set according to the required system.
System
VoIP LAN IP Address
172.16.0.10
VoIP GW IP Address
172.16.0.20
SIP Port
5080
Index
1 10-12-03
2 10-12-07
3 10-12-09
4 10-12-10
5 10-46-14
6 15-05-45
1-484
Table 1-35 Example - IP Terminal Setting on page
Router A
172.16.0.254

Figure 1-23 Example- NAT Traversal

Table 1-34 Example - System Setting

PRG Default
0.0.0.0
0.0.0.0
172.16.0.10
255.255.0.0
0:OFF
1
1-484, Table 1-34 Example - System Setting on
1-485.
Internet
10.1.1.1 10.1.1.2 Router B
172.17.0.254
Input Data
172.16.0.254 LAN IP address of Router A
10.1.1.1 WAN IP address of Router A
172.16.0.10 LAN IP address of VOIPDB
255.255.0.0 Subnet Mask of VOIPDB
1:ON NAT Mode
1 NAT RTP send port choice
ISSUE 1.0
IP Terminal
IP Address
172.17.0.100
SIP Port
5060
Remark
IP Multiline Station (SIP)