Subject : Inquiry Regarding DTMF Support on 7Semi EC200U-CN LTE 4G Module
I am currently working on an IVR technology project and am using the 7Semi EC200U-CN LTE 4G GPS GNSS Mini Industrial Modem. I intend to use DTMF (Dual-Tone Multi-Frequency) signals for user recognition and input handling.
I would like to know:
- Does the EC200U-CN module natively support DTMF detection and processing?
- If supported, what are the AT commands or configurations required to enable and use DTMF functionality?
- If not natively supported, is there any recommended external hardware or workaround to achieve this functionality with the module?
I would appreciate any documentation or guidance you can provide on implementing DTMF with this module.
Looking forward to your response
