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Bandwidth provides a robust Voice/Calls Communication API that enables developers to integrate voice calling features into their applications. This tool is essential for creating applications that require voice communication capabilities, such as customer support systems, conferencing solutions, and more.
One common issue developers encounter when using Bandwidth's API is that DTMF (Dual-Tone Multi-Frequency) tones are not recognized during calls. This can manifest as the system failing to respond to user inputs, such as menu selections or authentication codes entered via keypad.
The root cause of DTMF tones not being recognized often lies in the incorrect configuration of the DTMF signaling method. Bandwidth supports multiple DTMF signaling methods, including RFC2833, SIP INFO, and In-band. Each method has its own use case and configuration requirements.
This method sends DTMF tones as RTP (Real-time Transport Protocol) events. It is widely used and generally preferred for VoIP communications.
In this method, DTMF tones are sent as SIP INFO messages. It is less common but can be useful in specific scenarios where RTP is not suitable.
DTMF tones are sent as audio signals within the voice stream. This method is typically used when other methods are not supported.
To resolve the issue of DTMF tones not being recognized, follow these steps:
Check the current DTMF signaling method configured in your application. This can usually be found in the settings or configuration files of your VoIP system or application.
Based on your application's requirements and the capabilities of the devices involved, configure the appropriate DTMF signaling method:
After making the necessary changes, conduct a test call to verify that DTMF tones are recognized correctly. Use a test environment to avoid disrupting live services.
Monitor the system's performance and make further adjustments if necessary. Ensure that all endpoints involved in the communication support the chosen DTMF method.
For more information on configuring DTMF signaling methods, refer to the following resources:
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