
92 Advanced ISDN Call Control
ATDB1 use B1 channel in Originate mode.
ATDB2 use B2 channel in Originate mode.
ATDB3 use both B1 and B2 channels in Originate mode.
ATAB1 use B1 channel in Answer mode.
ATAB2 use B2 channel in Answer mode.
ATAB3 use both B1 and B2 channels in Answer mode.
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