Avaya X.25 User Manual Page 38

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Configuring X.25 Services
1-18 117377-A Rev. A
IPEX Mapping
For each established VC connection that contains a specified X.25 called address
(X.121 address), IPEX establishes a TCP connection from IPEX to a TCP/IP
server. This connection consists of the IP address and the TCP port number of a
remote TCP/IP peer that correspond to the X.25 called address. To enable
X.25-to-TCP conversion, you must configure the following information:
The point of attachment (that is, the circuit interface) on the IPEX system at
which the VC establishes the connection.
The VC LCN range at the packet level.
The X.25 called address of the incoming call request from the X.25
DTE/DCE to IPEX.
The associated remote TCP socket (IP address and TCP port number) that
identifies the destination of the TCP connection.
This mapping sets a path for forwarding data received on an X.25 virtual circuit to
a specific remote TCP/IP peer.
Mapping Types
To configure IPEX, you must select either local or end-to-end mapping, which
determines whether facilities, call user data, M-bit and Q-bit support terminate
locally or are passed across the TCP/IP connection.
If you set the mapping type to local, IPEX ports can support different packet sizes
at each end, but message size can be no longer than 4 KB.
If you configure end-to-end mapping, all IPEX ports must have the same packet
and window size, or the M-bit support will not function properly. End-to-end
mapping allows unlimited message size.
IPEX Connection Summary
To set up a reliable tunneling session, each side must successfully establish a
connection. When one side receives a call request, the other side attempts to
connect. If the connection attempt fails on the remote side, the local side will
reject the call request it received because the tunneling session cannot be set up.
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