An encapsulation of the act of muting or unmuting a call.
- iOS 10.0+
CXSet is a concrete subclass of
CXCall. When the user or the system mutes a call, the provider sends
provider(_: to its delegate. The provider’s delegate calls the
fulfill() method to indicate that the action was successfully performed. When a caller mutes a call, that caller is unable to communicate with other callers until they unmute the call. A muted caller still receives communication from other unmuted callers.