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Opera 4 IP System Manual
Page 24
These ISDN external numbers must be associated with one or both of the T0 line interfaces that
may be on the system. This is required for outgoing ISDN calls to present a CLI that is
recognised as a valid number for the Trunk interface by the ISDN network. This is done on the
‘External No. Trunk assignment’ page under ‘ISDN Trunks’ as shown below.
For each external number, tick the ISDN T interface associated with this number and press
‘Save’.