To configure call waiting on your Snom M58 DECT Deskset to notify you of incoming calls without an audible tone, follow these steps:

Access the Call Waiting Settings:

• Press the MENU/Confirm key on your M58.
• Navigate to Call Features and press OK.
• Scroll to Call Waiting and press OK.(ManualsLib, manualzz.com)
1. Select the Desired Call Waiting Mode:
• Choose from the following options:

§  On: Both visual and audio indications for incoming calls.

§  Off: Disables call waiting; incoming calls will receive a busy signal if you're already on a call.

§  Tone off:  Sets call waiting without an audio indication for incoming calls.

• For your requirement, select Tone off  to receive visual notifications without an audible tone.
• Press Set to save your selection.(ManualsLib, manualzz.com)

This setting ensures that during an active call, you'll see visual alerts for incoming calls without any audible interruptions.(manualzz.com)

To enable Call Waiting on your Snom M500 system, you can use either the Web User Interface (WebUI) or configure it via XML provisioning. Here's how to do it:

✅ Enabling Call Waiting via WebUI

1. Access the WebUI:
• Open a web browser and enter the IP address of your Snom M500 base station.
• Log in using your administrator credentials.
2. Navigate to Call Settings:
• Go to System → SIP Account Management → Call Settings.
3. Enable Call Waiting:
• Locate the Call Waiting option.
• Set it to Enabled.
4. Save Changes:
• Click Save to apply the new settings.