4.4 Call Confirmation Types
The settings included in this subsection apply to alarm calls (sets 1, 2), check calls and trouble reports.
1. With DTMF Confirmation
Up to 6 telephone numbers plus the count of repetitions can be stored for control centre dialling. 2N® Lift8 then tries to call all the numbers stored. Tone dialling (DTMF) is the most reliable service for confirmation of successful calls. Having received a call manually, the control centre officer has to press the 
button on its tone-dialling phone. If the called line is busy or unanswered within a timeout, or the call is not confirmed, 2N® Lift8 dials the next number in the sequence until it exhausts all the pre-set attempts. The procedure is the same for check calls or failure reports but a separate group of six numbers can be used.
Evaluation of Situations in Dialling with Confirmation
Situation | 2N® Lift8 activity |
|---|---|
No dialtone on the line (PSTN line only) | L8 hangs up. |
Busy tone after dialling end | L8 hangs up and dials the next number. |
Call or silence (after dialling end) | L8 waits for the defined time (parameter 913). |
Ringing tone | L8 waits for the defined time (parameter 913). |
Continuous tone (on PBX line, e.g.) | L8 hangs up and dials the next number. |
DTMF char | L8 hangs up immediately and dials the next number. |
DTMF char | L8 confirms receipt ("Connection confirmed") and mutes the currently played announcement. The call goes on for the maximum call time as configured. |
| These digits are interpreted as control characters (refer to Subs. 4.2 , Tone Dialling Control during Call). |
Note
- The PSTN connection quality is not so high as to identify the above mentioned situations reliably in all cases. Moreover, excessive noise in the lift cabin may decelerate automatic dialling (due to inability to recognise the busy tone, e.g.). In general, DTMF is the most reliable type of signalling and so is used for confirmation. Thus, the connection is established (yet for a shorter time than usual) even in extreme cases, e.g. when 2N® Lift8 cannot identify the DTMF.
2. Automatic Redialling of Multiple Numbers without Confirmation (GSM/UMTS/VoIP Only)
This mode is useful where no trained personnel for automatic dialling with confirmation are available. The called party does not have to press any button. The two modes share a set of numbers and count of cycles, respond identically to the busy tone, etc.
The only difference is that the confirmation-less mode detects the ringing tone and recognises that the called party is off-hook (i.e. answers the call) when the ringing tone terminates before the timeout end.
The message speaker cannot be controlled using buttons to 
.
Evaluation of Situations in Voice Dialling without Confirmation
Situation | 2N® Lift8 activity |
|---|---|
Busy tone | L8 hangs up in approx. 2 seconds and dials the next number. |
Call/silence | L8 waits for the defined time (answering timeout), then hangs-up and dials the next number. |
Ringing tone | L8 waits for the defined time (answering timeout), then hangs-up and dials the next number. |
Warning
- Make sure in this mode that no VoiceMail box, FAX or any other equipment are assigned to the numbers to be dialled that might answer the call before the pre-programmed timeout end and thus terminate automatic dialling.
3 and 4. CPC (Antenna and KONE)
Used wherever the counterparty is equipped with the required SW. When the line is answered, a DTMF string is sent and the lift is identified. The call is either switched to voice communication (alarm call) or confirmed automatically and terminated (check call), as the case may be.
5. P100
Used wherever the counterparty is equipped with the required SW. When the line is answered, a DTMF character is sent and the lift is identified. The call is either switched to voice communication (alarm call) or confirmed automatically and terminated (check call), as the case may be.
6. DTMF Protocol AutoDetection (CPC/P100)
Having received a DTMF string, the lift recognises the protocol used and responds accordingly.
Warning
- 2N® Lift8 may have troubles detecting DTMF characters and recognising the protocol in places with a poor signal quality.
- If such troubles occur, we recommend you to change the CPC Antenna/P100 (3/5) settings.
7, 8, 9. CPC (Antenna a KONE), P100 2N ext
These protocols work as CPC in items 3 and 4 and P100 in item 5 above for emergency calls. The only difference is that the shaft number and audio unit type are transmitted too.
With 2N ext, error states OK can be transmitted too in operational calls (battery replaced, audio repaired, button repaired).