Routing algorithm for incoming calls – 2N VoiceBlue MAX v1.3 User Manual

Page 35

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If the selected GSM/UMTS module is available and has a sufficient credit, the
GSM gateway will start dialling the GSM number.
If the calling subscriber number has an unknown prefix or all routes are

rejects the connection request.

2N VoiceBlue MAX


The outgoing call is not billed until the called party answers the call.
The GSM network signals the call answering moment and the GSM gateway
transfers this information to the SIP Proxy.
It can be set for GSM outgoing calls that the calling subscriber should be sent the
connection tone* instead of a silence between the request sending to GSM and
the ringing tone.

* This option can be activated for TC35i modules.

Routing Algorithm for Incoming Calls

Incoming calls are processed according to the

parameter setting in the



table. The following options are available:

incoming groups

Reject/Ignore incoming calls – incoming calls are not routed to the VoIP
network. On the GSM side, the connection request is either rejected or ignored
(the caller hears the check ringing tone).
If the above mentioned option is not selected, the CLIP routing table is checked.
If the calling number is found, it is checked for CallBack first. If the CallBack
function is enabled for this number,

will ignore the

2N VoiceBlue MAX


incoming call and set up a CallBack to GSM after the caller hangs up. If the
AutoDial function is enabled for the calling number, the caller will be routed
directly to the extension number entered in the AutoDial item. If both the
CallBack and AutoDial functions are activated,

will ignore

2N VoiceBlue MAX


the incoming call and set up a call to GSM after the caller hangs up.
Simultaneously, a call to the VoIP extension will be set up and then the calls will
be connected. If the CallBack function is enabled and the caller fails to hang up
within 10 s,

will try to set up a call according to the

2N VoiceBlue MAX


AutoDial settings.
In case the CLIP routing function is disabled or the calling number is not included
in the CLIP routing table, the Dynamic CLIP routing table is checked. If the
calling number is found, the incoming call is routed directly to the corresponding
extension. To set the Dynamic CLIP routing function use the GSM incoming




If the incoming call is still not processed, the gateway will receive the call and
send either a voice message or the dialtone to the caller. After that, 2N


awaits the required count of digits necessary for connection

VoiceBlue MAX
set-up. Set the minimum and maximum counts of DTMF digits in the GSM


incoming groups

does not receive the minimum count of digits and no

2N VoiceBlue MAX


other digit comes within the timeout set in the DTMF dialling timeout
parameter, the call is forwarded to the operator as if the called extension number
were unknown.
If call forwarding to the operator is inactive, the incoming call will be rejected.