I am having this same issue with iOS 182. on Xcode 16.2. I have the same behaviour even when using a custom ringtone.
let update = CXCallUpdate()
update.supportsHolding = true
update.supportsGrouping = true
update.supportsUngrouping = true
update.localizedCallerName = caller
and
static var providerConfiguration: CXProviderConfiguration = {
let providerConfiguration = CXProviderConfiguration()
providerConfiguration.maximumCallsPerCallGroup = 2
providerConfiguration.supportedHandleTypes = [.generic, .phoneNumber]
return providerConfiguration
}()
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The behaviour I am seeing is that if the second incoming call is Cellular it beeps, but if the second call is also from my CallKit implementation there is no beep