User`s guide

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Send X.25 Restart packet on receipt of SABM frame
This parameter can be set to “No” or “Immediate”. When set to “Immediate”, the LAPB
instance will send an X.25 restart packet immediately on receipt of an SABM (Set
Asynchronous Balanced Mode) frame. If the parameter is set to “No”, then no X.25 restart is
sent.
Configuration - Network > Legacy Protocols > X.25 > LAPB n > ISDN
Parameters
Allow this unit to answer calls
When this parameter is enabled this instance of LAPB will answer incoming ISDN calls.
Only accept calls from calling number ending with
This parameter provides the filter for the ISDN Multiple Subscriber Numbering facility. It is
blank by default but when set to an appropriate value with “Allow this unit to answer calls”
enabled it will cause the unit to answer incoming calls only to ISDN numbers where the
trailing digits match the MSN value. For example, setting the MSN parameter to 123 will
prevent the unit from answering any calls to numbers that do not end in 123.
Only accept calls with sub-address ending with
This parameter provides the filter for the ISDN sub-addressing facility. It is blank by default
but when set to an appropriate value, with “Allow this unit to answer calls” enabled it will
cause the unit to answer incoming ISDN calls only where the trailing digits of the sub
address called match the Sub-address value. For example, setting the Sub-address to 123
will prevent the unit from answering any calls where the sub-address called does not end in
123.
Keep ISDN LAPB link activated when user sends a DISC or X.25 PAD session
terminated
When this parameter is enabled
Wait x milliseconds before attempting to establish the LAPB link after B-channel
becoming active
This parameter sets the length of time (in milliseconds), that the LAPB instance will wait
from an ISDN B-channel becoming active before attempting to establish a LAPB connection,
i.e. the length of time for which the LAPB instance stays passive. The default is 0 as most
ISDN networks allow CPE devices to initiate a LAPB link. If your ISDN network does not
permit CPE devices to initiate the LAPB link you should set this parameter to a value that
allows the network sufficient time to establish the LAPB link.
Use as x a calling party number when making ISDN calls
This is “Calling Line Identification”. The unit will only answer calls from numbers whose
trailing digits match what is entered in this field. The line the unit is connected to must have
CLI enabled by the telecoms provider, and the calling number cannot be withheld.