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OSI/AS Configuration and Management Manual

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NSAP Addressing
OSI/AS Configuration and Management Manual—424119-001
3-7
X25 1980 Versus 1984 Addressing
X25AM supports extended addresses (1984 addressing standards) for the following
types of packets, described in the following subsections on this page:
•
Outgoing Call Request Packets
•
Incoming Call Request Packets
•
Outgoing Call Accepted Packets
•
Incoming Call Connected Packets
Extended called addresses are not used in clear request packets and are ignored in clear
indication packets.
Outgoing Call Request Packets
For outgoing call request packets, X25AM inserts called and calling address extensions
if the subdevice is configured with local/remote address extension.
Incoming Call Request Packets
If an incoming call request packet contains a 1980-format called address, X25AM
selects only subdevices with 1980-format local address configured, using the port
number.
If an incoming call request packet contains a 1984-format called address, X25AM
selects only subdevices with 1984-format local address configured. The call is routed to
a subdevice if the called address extension matches the subdevice local address
extension value. The port number is ignored.
The calling address extension in an incoming packet is used to update the remote
address extension of the selected subdevice. If an incoming call request packet contains
a 1980-format calling address, X25AM clears any configured remote address extension
and sets the length of the facility parameter field to 0.
Outgoing Call Accepted Packets
For outgoing call accepted packets, X25AM inserts called address extensions if the
subdevice is configured with local address extension.
Incoming Call Connected Packets
The called address extension in a call connected packet is used to update the remote
address extension of the subdevice (or the equivalent to a subdevice). If an incoming call
connected packet contains a 1980-format called address, X25AM clears any configured
remote address extension and sets the length of the facility parameter field to 0.