AIS AI2524 user manual Suppress or Replace the Calling Address, Suppress the Called Address

AI2524 Router Card User’s Manual

Suppress or Replace the Calling Address

Some attachments require that no calling (source) address be presented in outgoing calls. The requirement is called suppressing the calling ad- dress.

When attached to a PDN, X.25 may need to ensure that outgoing calls only use the assigned X.121 address for the calling (source) address. Routed X.25 normally uses the original source address. Although in- dividual X.25 route configurations can modify the source address, Cisco provides a simple command to force the use of the interface ad- dress in all calls sent; this requirement is called replacing the calling address.

To suppress or replace the calling address, perform the appropriat task in interface configuration mode:

z Suppress the calling (source) X.121 address in outgoing calls.

x25 suppress-calling-address

z Replace the calling (source) X.121 address in switched calls.

x25 use-source-address

Suppress the Called Address

Some attachments require that no called (destination) address be pre- sented in outgoing calls; this requirement is called suppressing the called address.

In interface configuration mode, suppress the called address:

x25 suppress-called-address

	Establish a Default Virtual Circuit Protocol
	The Call Request packet that sets up a virtual circuit can encode a field
	called the Call User Data (CUD) field. Typically, the first few bytes of
	the CUD field identify which high-level protocol is carried by the vir-
	tual circuit. The router, when acting as a destination host, normally re-
	fuses a call if the CUD is absent or if the protocol identification isn't
	recognized. The PAD protocol, however, specifies that unidentified
	calls be treated as PAD connection requests. Other applications re-
	quire that they be treated as IP encapsulation connection requests, per
	RFC 877.
	In interface configuration mode, configure either PAD or IP encapsu
	lation treatment of unidentified calls:
	x25 default {ip pad}
Page 12-12	August 1997
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