2N VoiceBlue MAX v1.2 User Manual
Voice parameters of GSM modules
Here you can set the voice level for the GSM modules in the GSM gateway.
Audio level DSP
Here you can set the voice level for calls in the signal processor of the GSM gateway.
Output audio level DSP [dB] – audio volume gain/loss to VoIP
Input audio level DSP [dB] – audio volume gain/loss to GSM
An excessively high volume may deteriorate the voice quality
(distortion, echo, etc.) and wrong DTMF detection!
Tone generated for incoming calls from GSM/UMTS
Dialtone – the dialtone type for GSM/UMTS incoming calls.
Ring tone – the ringing tone type for GSM/UMTS incoming calls.
Generate busy tone to GSM/UMTS – generation of the busy tone for call end.
function is enabled, the length of
Generate busy tone
the outgoing calls billed by the GSM/UMTS operator increases
Error GSM/UMTS causes
Here you can set the ISDN release cause for the states mentioned below. The call
that meets the below mentioned requirements will be rejected with a
user–defined cause (the ISDN cause number will be transformed into a SIP code
for VoIP according to the table shown below).
Lack of digits in OVERLAP mode – the call will be rejected that fails to meet
the minimum digits requirement.
Restricted number prefix – the call will be rejected whose prefix has not
been found in any of the prefix lists.
Selected module / GSM group is not ready – the call will be rejected in case
no GSM module is available in the LCR–selected GSM outgoing group.
Selected module / GSM groups are not ready – the call will be rejected in
case no GSM module is available in the LCR–selected GSM outgoing groups.
Here you can convert the release cause received from GSM/UMTS into another ISDN
release cause. The resultant ISN cause number will be transformed into a VoIP SIP
code as included in the table below: