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ISDN Configuration Guide I-3
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.