2N BRI Lite/Enterprise v1.6 - Manual (Page 64)

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Error GSM/UMTS causes
Set the ISDN release cause for each of the below mentioned statuses. Every call
that meets any of the below mentioned requirements, will be rejected with a user
defined cause (the ISDN cause number will be translated to VoIP as a SIP code
as defined below).
Lack of digits in OVERLAP mode – any call that fails to meet the minimum
digits count requirement will be rejected.
Restricted number prefix – any call whose prefix is not included in any of
the prefix lists will be rejected.
Selected module / GSM group is not ready – a call will be rejected in case
there is no available GSM module in the selected (by LCR) outgoing GSM
group.
Selected module / GSM groups are not ready – a call will be rejected in
case there is no available GSM module in the selected (by LCR) outgoing
GSM groups.
Cause translation
The release cause received from GSM/UMTS can be converted into another ISDN
release cause. The resultant ISDN cause number will be converted into a SIP code
according to the table below:
Caution
If the function is enabled, the duration of outgoing Generate busy tone
calls billed by the GSM/UMTS provider will be extended!