DCP Series X.25 Packet Switched Communications Software (PSCS ...

Introduction
Using DTE statements as filters for incoming calls
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Previous releases of X.25 PSCS allow you to define DTE statements for certain Level 4
programs so that only call packets from those DTEs would be accepted. The Level 4
programs are the X.29 network PAD, or one of the user-written Level 4 programs
implementing the national, international, or user-defined protocols. All four of the
Level 4 program types can be routed based on the protocol ID information contained
in the call user data field of the incoming call packet. However, if at least one DTE
statement is configured for the Level 4 program, then routing based on the protocol ID
becomes disabled and the call is accepted only if its DTE address matches the
configured address. X.25 PSCS automatically rejects incoming calls for the Level 4
program that is not configured.
In X.25 PSCS 5R2, this is no longer automatically available. This capability must be
configured using the X25ROUTE statement. To configure DTE statements for the X.29
network PAD and have all other incoming calls for the X.29 network PAD
automatically rejected, do the following:
• Use DTE statements to define the list of acceptable X.29 network PAD DTEs.
• Define the following X25ROUTE statement:
XRTEPAD X25ROUTE SEARCH=ADDRESS
Reference the statement name from the PDNGRP or X25DEF statement.
Only incoming call packets that are configured with the DTE statements will be
accepted. X.25 PSCS will automatically reject all others.
To accept incoming calls for other Level 4 types in addition to the X.29 network PAD
Level 4, routing is based on protocol ID information. For example, if other Level 4
types are OSITS and TCP-IP Stack program products, define the following X25ROUTE
statement:
XRTEPAD X25ROUTE SEARCH=(ADDRESS,PROTOCOL),;
PROTOCOL=(IPOSI,TPOSI,TPCCITT,IPTCP)
Note that the X.29 network PAD Level 4 type (X29PAD) is not included as one of the
PROTOCOL parameter's values.
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