User`s guide

158 XSR User’s Guide
Answering Incoming ISDN Calls Chapter 8
Configuring Dialer Services
Answering Incoming ISDN Calls
The XSR handles incoming ISDN calls as follows:
 Always accepts incoming calls.
 If there is only one dialer interface configured it will bind the
incoming call to that interface.
 If there is more than one dialer interface configured, the XSR will
attempt to map the incoming call to only one of these interfaces based
on any of the following data passed by the ISDN switch:
– Called number.
– Calling number.
 Mapping based on the called number is performed if the following
conditions are met:
– The ISDN switch passes called number data to the XSR. Note that
not all types of switches can provide this information.
– The called number is configured under the target dialer interface
using the
dialer called command.
 Mapping based on the calling number is performed if the following
conditions are met:
– The ISDN switch passes the calling number to the XSR data. Note
that not all types of switches can provide this information.
– The calling number is configured under the target dialer interface
using the
dialer caller command.
 Incoming calls may be mapped to a dialer interface based on the PPP
authenticated username if the following conditions are met:
– The username must be configured under the dialer interface
using the
dialer remote-name command.
– Interface dialer 0 is configured with the desired PPP
authentication (e.g.,
ppp authentication pap).
 In the case where a dialer interface is configured for multipoint
operation using the
dialer map command, incoming calls are
mapped based on the calling number matching the dialer string set by
the map or on the PPP authenticated username matching the name set
by the
dialer map command.
 In the case where no dialer interface is found using the methods
described above, the XSR will display a high severity alarm stating
cannot bind inbound call and will disconnect the ISDN call.