[FEATURE REQ] Add option to not ring via CallKit

[JasonWeinzierl]

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

If an application is using Teams interop to receive incoming Teams calls, CallKit will ring the iPhone as expected. However, if the user has installed both the Teams interop application using this SDK, as well as the official Teams iOS app, then both applications will ring via CallKit. This may confuse users.

Describe the solution you'd like

Provide a flag in CallKitOptions to disable incoming call notifications.

Describe alternatives you've considered

• Disable CallKit functionality completely (don't pass in CallKitOptions when creating a CallAgent). Not too appealing because then you lose all the benefits of CallKit.
• Manually implement CallKit and don't trigger incoming call notifications. Would take extra work to maintain, considering how CallKit is already implemented in this SDK for us.

Additional context

N/A

Information Checklist

Kindly make sure that you have added all the following information above and checkoff the required fields otherwise we will treat the issuer as an incomplete report

• [x] Description Added
• [x] Expected solution specified

[tjprescott]

@raosanat can you take a look?