Opera 4 IP System Manual
Page 22
3.5.
Programming the External Lines
The Opera 4 IP may have up to two external line interfaces. These, if fitted, may be used to
connect either ISDN To lines or analogue trunk lines.
You may program these lines as ISDN or analogue on the page ‘System Line Selection’
When ISDN T0 lines are connected, you must program the ISDN telephone numbers
associated with each T0 interface into the Opera system. These numbers are entered on the
‘External Number List’ as shown below.
