Configure Protocol Switch software
Digi TransPort User Guide 583
NUA to Interface Mappings
This page contains a table to enter a series of X.25 NUA or NUI values along with IP addresses/
Ports to which they should be mapped, if you need to override the default settings in the
Configuration > Network > Legacy Protocols > X.25 > NUA/NUI Interface Mappings page.
If, in the Protocol Switch configuration, you had configured the router to switch from LABP 0 to
TCP, the IP Address and Port values would normally be determined from the XOT Remote IP
address and IP stream port parameters. However, having set up the NUA/NUI to IP addresses
table as shown in the example above, if an X.25 call with NUA of value 222 is received on LAPB 0,
it is switched onto a TCP socket using IP address 1.2.3.4 on port 45 instead of the settings
configured on the Configuration > Network > Legacy Protocols > X.25 > NUA/NUI Interface
Mappings page.
Similarly, NUIs can also be matched. In this example, a call with NUI of value test is switched onto
a TCP socket using IP address 100.100.100.1 on port 678.
All three comparison fields, NUA, NUI and Call Data can use the wildcard matching characters ?
and *. In the example shown above, when an X.25 call is received with either the NUA having
1234 followed by any 2 digits or a call being received with call user data with any 4 characters
followed by aa, the call is switched to a TCP socket on address 100.100.100.52 on port 4001.
When a connection has been successfully established and data is being switched from the X.25
call to the socket and from the socket to the X.25 connection, it can be terminated by either the
socket closing or the X.25 call clearing.
If the connection terminates because of an incoming X25 CALL CLEAR packet, the switch
terminates the socket connection. If the connection terminates because the socket is closed, the
switch clears the X.25 call by transmitting a CALL CLEAR packet.
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