3Com MSR 50 Series Configuration Manual page 304

304 C 14: X.25
HAPTER AND
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ONFIGURATION
only of those incoming calls matching the mapping specified as preference rule,
but lets other incoming calls with CUG facilities pass through. The details are:
1 Incoming suppression policy, in which the system lets the incoming calls without
CUG facilities pass through, but suppresses the incoming calls with CUG facilities
but without access configuration configured by the CUG mapping rule.
2 Outgoing suppression policy, in which the system lets the outgoing calls without
CUG facilities pass through, but suppresses the outgoing calls with CUG facilities
but without access configuration configured by the CUG mapping rule.
3 All suppression policy, in which the systems removes CUG facilities (if any) and
make call processing for all incoming calls. This policy is ineffective to outgoing
calls.
4 Preference mapping suppressing policy, in which the system removes CUG facilities
and make call processing for the incoming calls with CUG facilities and with
preference mapping rule, but lets the incoming calls without preference mapping
rule pass through. This policy is ineffective to outgoing calls.
You can only configure the CUG function on an X.25 interface working as DCE,
that is, you must specify the serial interface as DCE when specifying the X.25
protocol on it.
CUG mapping and suppression rule
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CUG mapping refers to CUG number conversation from local end (DTE) to
network end (X.25) during CUG call processing. For example, when processing the
call from the DTE with CUG 10 to DTE with CUG 20, the system first searches the
mapping table for this mapping entry: if the table has this entry, it forwards the
packets, if not, it denies the forwarding.
You can define suppression rules in configuring CUG mapping, including three
types:
Outgoing call restriction
■
Incoming call restriction
■
Specifying as preference rule
■
Specifying as preference rule depends on CUG suppression policy. That is, if the
suppression policy is configured as only suppressing the CUG of preference
mapping, then the system removes the CUG facilities in the incoming call packet
of this mapping and makes call processing.
You must configure CUG function on X.25 DCE interface, that is, you must specify
it as DCE end in encapsulating X.25 protocol on serial interface.
Configuration procedure
To configure CUG, use the following commands:
To do...
Enter system view
Enter interface view
Use the command...
system-view
interface interface-type
interface-number
Remarks
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