2N StarGate/BlueTower v5.4 - Manual (Page 83)

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Tone Generated for Incoming calls from GSM/UMTS
Dial tone – set the dial tone for incoming calls from GSM/UMTS.
Ring tone – set the ring tone for incoming calls from GSM/UMTS.
Generate busy tone to GSM/UMTS – enable busy tone generation for call
termination.
Caution
If the Generate busy tone function is enabled, the duration of
outgoing calls billed by the GSM/UMTS provider will be
extended!
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.