---
title: TinyGsmCalling
---

# TinyGsmCalling (class)

**Module:** **[TinyGsmCalling](class_tiny_gsm_calling.html)**

The CRTP parent class for voice and DTMF calling functions.

`#include <src/TinyGsmCalling.tpp>`


## Phone call functions



### Public Functions

|                | Name           |
| -------------- | -------------- |
| bool | **[callAnswer](#a6b4a239a88045684c75450ba1fed7357)**() <br>Answer an incoming phone call. |
| bool | **[callNumber](#ac37617522cec7757a026ff4afde827e2)**(const String & number) <br>Make a phone call. |
| bool | **[callHangup](#ad526aeba6fa6c5cadfc62bf0be261cb7)**() <br>Hang up an in-progress phone call. |
| bool | **[dtmfSend](#a8bcc2a98729f0c4fe2b4a67d1a1e3cfc)**(char cmd, int duration_ms = 100) <br>Sent a DTMF (dual tone multi frequency) message over a phone call. |

## Public Functions Documentation

### Phone call functions



#### functioncallAnswer
<a id="a6b4a239a88045684c75450ba1fed7357"></a>

```cpp
bool callAnswer()

```



- **Return**: True if the call was answered successfully, false otherwise

#### functioncallNumber
<a id="ac37617522cec7757a026ff4afde827e2"></a>

```cpp
bool callNumber(const String & number)

```



- **Parameters**:
  - **number** The number to call
- **Return**: True if the call was made successfully, false otherwise

#### functioncallHangup
<a id="ad526aeba6fa6c5cadfc62bf0be261cb7"></a>

```cpp
bool callHangup()

```



- **Return**: True if the call was hung up successfully, false otherwise

#### functiondtmfSend
<a id="a8bcc2a98729f0c4fe2b4a67d1a1e3cfc"></a>

```cpp
bool dtmfSend(char cmd, int duration_ms = 100)

```



- **Parameters**:
  - **cmd** The command to send
  - **duration_ms** The tone duration
- **Return**: True if the DTMF message was sent successfully, false otherwise

-------------------------------

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Updated on 2026-09-11