Eicon Networks DIVA T/A ISDN Modem manual AT!X13=n when Bacp is disabled, see, AT!X14=n

Always On / Dynamic ISDN AT Commands

AT!X13=n	Delay Before Opening 2nd B-channel (with BACP enabled). Specifies the amount
	of time (in seconds) the throughput on your 1st B-channel must exceed the Opening
	Threshold (AT!X14=n) before the 2nd B-channel is added to the AO/DI connection.
	For example, if you specify 5 seconds, and the Opening Threshold is 70%
	(AT!X14=70), once the throughput on the 1st B-channel reaches 70%, there will be a
	delay of 5 seconds before the 2nd B-channel is added to the AO/DI connection. If the
	throughput drops below 70% during the 5 seconds, the 2nd B-channel will not be
	added to the connection.
	Range: 0 to 65535.
	Default: 5 seconds. Note that if the ISDN Switch Type is set to Singapore (AT!C1=6)
	then the default is 60 seconds.
	Note: The description above applies only if BACP is enabled; for a description of
	AT!X13=n when BACP is disabled, see page 47.
AT!X14=n	2nd B-channel Opening Threshold. Specifies the threshold (percentage) that the
	throughput on your 1st B-channel must exceed before the 2nd B-channel is added to
	the AO/DI connection.
	Range: 0 to 100.
	Default: 70.
AT!X15=n	2nd B-channel Closing Threshold. Specifies the threshold (percentage) that the
	throughput on your 2nd B-channel connection must be below before the 2nd
	B-channel is dropped from the AO/DI connection.
	Range: 0 to 100.
	Default: 40.
AT!X16=n	Strips Area Code from Numbers. Tells BACP to drop the area code from phone
	numbers received from the remote peer.
	For example, if you are dialing a number with the same area code, if you specify
	AT!X16=1, the area code is dropped from the number.
	n=0	Off (default).
	n=1	On.
AT!X17=n	Specify X.25 Transmit Queue Threshold. When the queued data goes over this
	limit, for the period of time specified with AT!X10, the 1st B-channel will be added to
	the AO/DI connection.
	For example, if 1000 bytes are queued in the X.25 link, the 1st B-channel connection
	will be opened after the delay specified by AT!X10.
	Range: 0 to 65535
	Default: 1000 bytes.

DIVA T/A ISDN Modem Reference Guide ◆ Page 51