Section 5.25. Public Network Exchange Signalling DTMF (Suffix Dialling)

5.25. Public Network Exchange Signalling DTMF (Suffix Dialling)

This feature enables special functions which require DTMF suffix dialling, e.g. public services such as CITYCALL as well as Code-Calling with DISPLAY OPERATION, Voice Mail systems and dictation equipment in private telephone systems, to be used by all OpenScape 4000 voice terminals (ANATEs and DIGITEs) via the public network exchanges. This means converting suffix-dialled digits to DTMF signals on the exchange line, which is achieved by means of dial-up converters for lines without DTMF signalling, or simply by seizing a specific line with the necessary DTMF converter parameters by dialling the appropriate route code when setting up a connection. Callers switched via these routes by the attendant will not be able to use the converter functions. If a DTMF conversion route code is dialled, or a dial-up DTMF converter is called up during an established call (suffix-dialling), DIGITEs can receive a notification text on their displays. This text must be entered by means of an AMO. One SIU Type 2 module must be assigned for each LTG for receiving and transmitting the DTMF signals.

Assign a SIU Type 2 (Q2031-X1) to each LTG:
```
AD-BCSU:MTYPE=SIUP,LTU=number,SLOT=number,PARTNO=string; 
```
Please also refer to the BCSU AMO description "Assigning a SIU".

In networked systems, the DTMF conversion is always carried out in the home node of the station.
Assign the code for the dial-up DTMF converter in the DPLN:
```
AD-WABE:CD=key-num,DAR=DTMFCONV; 
```

Assign the route code for the dial-up DTMF converter:

AD-RICHT:TYPE=CD,CD=key-num,SVC=param,DTMFCNV=SUFDIAL

CHA-RICHT:TYPE=CD,CD=key-num,SVC=param,TYPE=DTMF,
DTMFCNV=SUFDIAL;

Assign the route code for the direct DTMF conversion route:
```
AD-RICHT:TYPE=CD,CD=key-num,SVC=param,DTMFCNV=FIX; 
```

Enter display notification for DIGITEs with AMO RICHT and the following parameters:

DTMFDISP = Parameter for defining display output options, with the values:

WITHOUT	no display output
FTEXT	Displays text entered with RICHT AMO under parameter DTMFTEXT
DIGIT	Displays text entered with RICHT AMO under parameter DTMFTEXT plus last dialled digit
DIGIT	Displays text entered with RICHT AMO under parameter DTMFTEXT plus last six dialled digits

DTMFTEXT = Text for DIGITE display output, if parameter DTMFDISP has been declared with FTEXT, DIGIT or DIGITS. Possible values: alphanumeric string, up to 16 characters.

DTMF conversion is also possible for LCR routes.

The appropriate commands can be found in the AMO RICHT description.

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