NEC SL1100 Networking Manual page 209

NEC SL1100
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ONDITIONS
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ESTRICTIONS
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Dynamic NAT
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Networking Manual
The NAPT feature requires CPU software V1.20 or higher.
Terminals using NAPT must be at firmware V1.0.0.0 or higher.
IP terminals can be connected via NAT router or WAN (direct connection).
The NAT router on the SL1100 side must have a static WAN IP address.
SL1100 V3.0 or lower software, the router may close the port being used if
packet exchange is not performed during a certain time frame. In this case
change Program 84-23-01 and Program 84-23-02 to a shorter interval. With
SL1100 V3.5 or higher software, change Programs 15-05-47 and 15-05-48 to a
shorter interval. These programs are changed on a per station basis. Non NAPT
phones will still use Programs 84-23-01 and 84-23-02 while only NAPT phones
will use Programs
15-05-47 and 15-05-48.
It is necessary to set Program 10-46-14 to OFF when the VoIPDB is assigned a
global (public) IP address.
When Program 10-46-14 is set to ON, it references programs 10-58-01 and
10-58-02. These programs are used to define any destination networks that do
not get sent through the NAPT translations.
UDP ports in the remote routers may be required to be forwarded to the IP
Terminals.
NAPT can be used for SIP trunks and terminals on the same system.
– S
TATIC
With static NAT, the terminal needs a static IP Address assigned to it, or entries
in the DHCP must be made to provide the same IP Address to the terminal.
The NAT router on the terminal side must have the function for setting up static
NAT.
A conversion table must be manually set up for the NAT router on the terminal
side.
If installing multiple terminals in the domain of the NAT router on the terminal
side, the RTP Self port and SIP Self port for each terminal must be specified so
as to avoid overlapping.
The SIP server cannot be switched. (Only one address can be registered as the
SIP server.)
The NAT router on the terminal side must have the function for setting up
dynamic NAT.
NAT
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