Create an X.25 X.400 Stack

You use an X.25 X.400 service MTA stack with an X.400 connector to connect an Exchange server to another system. The server on which you install the stack processes all messages from X.25 X.400 connectors that reference the stack.

The advantage of an X.25 X.400 service stack is that you can support existing X.25 protocols. The disadvantage of an X.25 X.400 service stack is that you must verify that local and remote bridgehead servers and routers can support the X.25 protocol.

To create an X.25 X.400 stack:

1. Start System Manager
   On the Start menu, point to Programs, point to Microsoft Exchange, and then click System Manager.
2. Navigate to X.400.

   System Manager

   1. Administrative Groups
   2. Administrative Group
   3. Servers
   4. Server
   5. Protocols
   6. X.400
3. Right-click X.400, click New, and then click X.25 X.400 Service Transport Stack.
4. On the General tab, type a name for this transport stack in the Name box. The default is X.25 (servername). You can edit this name only when creating a new transport stack.
5. (Optional) To enter the X.121 address of the remote server as specified in the X.25 network service setup, on the General tab, in X.121 address, type the X.121 address.
6. (Optional) To specify additional connection data required by the X.25 provider, on the General tab, in Call user data, type the additional information. In Facilities, type options you want from the X.25 provider, such as /r for the reversal of charges.
7. (Optional) To further define the connector address for cases in which other services or applications are using the same transport stack, on the General tab, click OSI, to enter OSI address information. For the display of the address information, select Hexadecimal or Text. Enter hexadecimal characters or text characters for the T selector (transport service access point), S selector (session service access point), and P selector (presentation service access point).
8. (Optional) To specify the X.25 adapter port number, on the General tab, in I/O port, type a number between 0 and 255. The default is 1. The input/output (I/O) port you specify must not match the value of any other X.25 X.400 transport stack on the same server.
9. (Optional) To add notes regarding administration of this stack, such as details about the remote system, on the Details tab, in Administrative note, type pertinent information.
10. (Optional) After you create the X.400 stack, you can view the connectors that are using the stack by viewing the Connectors tab. You can only delete a stack when no connectors are using it. Thus, before you delete a stack you must either delete the connectors using it or configure them to use a different stack. By viewing the Connectors tab, you do not need to check all your connectors to see if they are using the stack.