Other Incoming Call Restrictions - Netopia 435 Reference Manual

ISDN Configuration Guide D-5
The table below shows which supported switch types can allow an
incoming call when ACO for data is on.
If ACO is on . . .
AT&T 5ESS AT&T 5ESS DMS-100 DMS-100
Type of switch:
custom National ISDN-1 custom National ISDN-1
Incoming call allowed? N/A Yes Yes* Yes*
* Must have two directory numbers assigned.
This table may not be a complete list of switch protocols that
support ACO. To find out if your switch protocol supports ACO, or to
turn ACO on, contact your ISDN service provider.

Other incoming call restrictions

A B-channel will not be relinquished to admit an incoming call if a
connection profile has B-Channel Usage set to 2 B-Channels.
A B-channel will not be relinquished to admit an incoming call when
there are two separate concurrent calls. Incoming calls are
automatically allowed in when there is at least one B-channel free.