Altigen MAXCS ACC 6.5 Administration Manual page 146

Chapter 11: Board Configuration
Figure 9. T1 PRI Protocol Configuration dialog box (top half)
Figure 10. T1 CAS Protocol Configuration dialog box (top half)
Selecting Span Types
T1 CAS—select this option to associate all channels on the span to T1 CAS.
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Regular ISDN PRI—select this option to indicate 23B+D ISDN PRI span and to
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designate the last channel as the D channel.
Enable Tie Trunk—check this box to enable a tie trunk. Tie trunks must terminate
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to a system also configured as a tie trunk.
This option not available when E1 CAS is selected.
Note:
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MAXCS ACC 6.5 Administration Manual