Digi TransPort User Manual page 104

ISDN parameters
This parameter restricts the range of numbers from which ISDN will answer incoming calls,
such as the ISDN interface will only answer a call if the trailing digits of the calling number
match what is specified by this parameter. For example, if this parameter was set to 3,
incoming calls from 1234563 would be answered but calls from 1234567 would not.
with ISDN MSN ending with
If answering is disabled this parameter is not used.
This parameter provides the filter for the ISDN Multiple Subscriber Numbering facility. It is
blank by default but when set to an appropriate value on an answering interface, it will cause
the unit to answer incoming calls to only telephone numbers where the trailing digits match
the value selected. For example, setting this parameter to 123 will prevent the unit from
answering any calls to numbers that do not end in 123.
with ISDN sub-address ending with
If answering is disabled this parameter is not used.
This parameter provides the filter for the ISDN sub-address facility. It is blank by default but
when set to an appropriate value on an ISDN answering interface, it will cause the unit to
answer incoming calls only to ISDN numbers where the trailing digits match the Sub-address
value. For example, setting the this parameter to 123 will prevent the unit from answering any
calls to numbers that do not end in 123.
Use the following local IP configuration
Local IP Address:
This is the IP address of the unit's ISDN answering interface. Set this field to the desired local
IP address.
Attempt to assign the following IP configuration to remote devices
Set this parameter if the remote system needs a supplied address. The interface makes an
attempt to negotiate an IP address from the IP address pool. Generally, this parameter is
enabled for incoming connections. This checkbox opens to show the following parameters.
Assign remote IP addresses from a.b.c.d to a.b.c.d
This is the range of IP addresses supplied to incoming callers. This parameter may require
alteration if the default value 10.10.10.0 to 10.10.10.4 does not suit the remote network
configuration.
Mask:
This specifies the IP netmask for the Remote network. This can be used to create a dynamic
route to the remote network whenever the ISDN interface is active.
Primary DNS server:
The answering ISDN interface would normally supply its own PPP IP address to the peer for
DNS requests. This parameter allows you to specify an alternative DNS IP address.
Secondary DNS server:
This parameter can supply a secondary DNS server IP address to the peer for DNS requests if
required.
Enable NAT on this interface
This parameter enables or disables IP Network Address Translation (NAT) on the answering
ISDN interface.
This checkbox opens to show the following options:
Digi TransPort User Guide 104