Originate voice calling from microphone by DTMF tone

Legacy Legacy AirPrime modules
1

Hi,

Can I originate voice calling from microphone by DTMF tone?

I know ATD command can originate voice calling but they’d like to originate it by DTMF tone from the phone.

Is is possible ?

Thank you.

–Takuya

2

Takuya,

The short answer to this if you are just talking about the basic firmware is no, the only way to initiate a call is through AT commands, the unit does not have an analogue decode on board which can translate the tones into a phone number and subsequently dial the number.

One possible solution is to write an Open AT application which opens the audio lines and subsequently uses the DTMF decoder to get the number and then dials it. There is no specifc exampoles that I can suggest that might help you do this, you would need to build if from scratch.

Regards

Matt

3

From what phone :question:

As Matt says, you’d need an Open-AT application running in the module to do this.

I’m pretty sure that DevStudio has an example (or examples) of receiving DTMF - as Matt said, you’d have to build these into a phone number, and then use the ADL Call service to make the call…

4

Hi,

Thank you for providing some comments.

In the another view, if there is external CPU that is connected to SL8084T by UART, can I use AT+WDDM to indicate the phone# that is decoded from DTMF signal ?

I tried following procedure but I never see the "+WDDI"return.

  1. Send “AT+WDDM”
  2. Ring the DTMF signal(123456) to the analog speaker of SL8084T

Is there any necessary setting to indicate it correctly ?

Thank you.

–Takuya

5

Where is this “DTMF signal” coming from?

It’s not entirely clear from the AT Commands manual, but I think that AT+WDDM only works for tones received in a call - from the other (remote) party?

I don’t understand what you mean by that?

6

Hi,

DTMF signal is coming from external Phone to microphone of SL8084T.
Then, I expected decoded number from DTMF will be indicated to AT command port.

Is my understanding wrong?

Thank you.

–Takuya

7
8

Takuya,

Yes your understanding is incorrect, the WDDM is only for decoding tones coming into the unit via the audio stream of a currently active call, it does not decode tones from the audio analogue input of the unit.

Regards

Matt