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BRI Lite gateway
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7.7.4. Progress elements
The purpose of progress elements is to describe the behaviour of terminals
involved in a connection. You can set here which progress elements should be
sent in the
SETUP_ACKNOWLEDGE, CALL_PROCEEDING, PROGRESS
and
ALERTING
messages. Please keep the configuration settings of your PBX or
router to avoid false evaluation of the messages transmitted by your GSM
gateway and thus connection establishing errors.
Number Meaning
1
The connection is not of the end-to-end ISDN type, further progress
messages will be sent in the voice band
2
The destination address is not of the ISDN type
3
The connection initiator address is not of the ISDN type
4
The connection returns to the ISDN
8
The communication of the interconnected systems led to a change of the
telecommunication service (for the end-to-end ISDN mode only)
10
Delay due to call interface failure
Tab. 5 –ISDN Cause Meanings
7.7.5. Release causes to ISDN
Cause messages are sent to those terminals whose connection request has been
rejected. They contain causes of rejection. For precise definitions of the messages
refer to the ITU-T Q.931 recommendation. You can set the type of the message to
be sent for any of the following events:
Lack of digits on OVERLAP mode
– the incoming call was
rejected because the number of digits of the calling party's
dialling was too low for successful connection (default = 102
– Recovery on Timer Expiry).
Restricted number prefix
– call rejection due to an unknown
prefix. The prefix does not match any item in the routing tables
(default = 21 – Call Rejected).
Selected module / GSM group is not ready –
call rejection due
to the busy status of all modules that have been selected for
routing calls to the particular destination (the module assigned
to the B-channel group is not available) and no other GSM
modules have been selected for the destination (default = 41
– Temporary Failure).
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