Altigen AltiWare ACC 5.1 Administration Manual page 124

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.
Custom ISDN PRI—select this option only when your PRI D channel is on the last
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channel. AltiGen dealers should work with AltiGen Technical Support to configure
this special case.
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.
Note: This option not available when T1 CAS is selected.
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AltiWare ACC 5.1 Administration Manual