2N BRI Lite/Enterprise v1.4 - Manual (Page 63)

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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:
Conversion table:
ISDN cause
value
Description
SIP
code
Description
1 Unallocated number 410 Gone
3 No route to destination 404 Not found
6 Channel unacceptable 503 Service unavailable
16 Normal call clearing BYE
17 User busy 486 Busy here
18 No user responding 480
Temporarily
unavailable
19 No answer from user 480
Temporarily
unavailable
21 Call rejected 603 Decline
22 Number changed 410 Gone
27 Destination out of order 404 Not found
28 Address incomplete 484 Address incomplete