different ringtone for unknown caller

[Rexadev]

Checklist

• [x] I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• [x] I have read the FAQ and my problem isn't listed.
• [x] I have taken the time to fill in all the required details. I understand that the feature request will be dismissed otherwise.
• [x] This issue contains only one feature request.
• [x] I have read and understood the contribution guidelines.

Is your feature request related to a problem? Please describe. Avoid spam callers.

Describe the solution you'd like

Describe alternatives you've considered

Additional context

[Rexadev]

@naveensingh please remove need triage

[spice42]

this would be the next best option is this cannot be implemented