Operation Manual

Advanced Configuration 195
Call Destination of Router A: ISDN Number: 20
Call Destination of Router B: ISDN Number: 10
3d. Set the Retry Mode to Retry All Failures.
3e. Set the Retry Limit Handling to Continuous At Limit.
3f. Set the Retry Interval Limit to 8 seconds.
Using Hunt Groups
If you applied for Hunt Group Numbers, you receive a single number
for different physical Basic Rate Accesses. Use of Hunt Groups is
possible with all supported D channel protocols except for D64S,
DS01, DS02 and GSM.
♦ To use Hunt Group numbering, configure an Interface Group and
set the Origination Subaddress on all interfaces to the same value
or leave the Origination Subaddress field empty. As a result, the
system selects any available interface associated with the group
for in- and outbound connection attempts.
When you set the Origination Subaddress on all interfaces of an
ISDN-Controller to the same value, incoming calls directed to this
subaddress will be forwarded to any interface. When you leave
this field empty, incoming calls directed to any subaddress will be
accepted at this interface. For incoming calls, remote sites can be
given one ISDN Number and one Subaddress to call your router.
♦ For LAN-LAN connections, set the Disconnect Timeout to "Same
As Inactivity Timeout" to avoid situations like the following:
If Hunt Group numbering is used for LAN-LAN calls and the
Disconnect Timeout value is higher than the Inactivity Timeout,
i.e. the logical connection is not terminated as soon as the physical
connection goes down, the following happens: When the remote
site tries to set up the physical connection after an Inactivity
Timeout and all interfaces on ISDN-Controller 1, which handled
the initial connection, are busy at that moment, the call is rejected
by ISDN-Controller 2, the interfaces of which belong to the same
Interface Group. This is because all parameters negotiated during
initial call set-up and all pieces of information on the remote site
are stored in ISDN-Controller A´s memory in order to take the
load of the server memory. Therefore, ISDN-Controller 2 does not
Advanced.pm6 27.05.97, 11:15195