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17-17
ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter 17 Configuring Signalling Features
Configuring Closed User Group Signalling
Note You can configure CUG service without any preferential CUG. If a preferential CUG is not configured
on the interface, and calls from users attached to this interface to unknown users are permitted, the calls
will proceed as non-CUG calls, without generating any CUG IEs.
For each CUG configured on the interface, you can specify that calls to or from other members of the
same CUG be denied. In ITU-T terminology, this is called outgoing-calls-barred (OCB) and
incoming-calls-barred (ICB), respectively.
Table 17-1 describes the relationship between the ITU-T CUG terminology and Cisco CUG terminology.
To configure an access interface and the CUGs in which the interface is a member, perform the following
steps, beginning in global configuration mode:
Example
The following example shows how to configure an interface as a CUG access interface and assign a
preferential CUG:
Switch(config)# interface atm 3/0/0
Switch(config-if)# atm signalling cug access permit-unknown-cugs both-direction permanent
Switch(config-if)# atm signalling cug assign interlock-code
4700918100000000603E5A790100603E5A790100.12345678 preferential
Displaying the CUG
To display the global CUG configuration, use the following privileged EXEC commands:
Table 17-1 Cisco CUG and ITU-T CUG Terminology Conversion
ITU-T CUG Terminology Cisco CUG Terminology
preferential CUG preferential
incoming access allowed permit-unknown-cugs to-user
outgoing access allowed permit-unknown-cugs from-user
incoming calls barred (ICB) deny-same-cug to-user
outgoing calls barred (OCB) deny-same-cug from-user
Command Purpose
Step 1
Switch(config)# interface atm card/subcard/port
Switch(config-if)#
Specifies an ATM interface and enter interface
configuration mode.
Step 2
Switch(config-if)# atm signalling cug access
[permit-unknown-cugs {to-user | from-user
permanent | both-directions permanent}]
Configures the interface as a CUG access
interface.
Step 3
Switch(config-if)# atm signalling cug assign
{alias alias-name | interlock-code
interlock-code} [deny-same-cug {to-user |
from-user}] [preferential]
Configures the CUG where this interface is a
member.