Class android.telecom.`Call.Callback`

Added Methods
`void` `onRttInitiationFailure`(`Call,` `int`)
`void` `onRttModeChanged`(`Call,` `int`)
`void` `onRttRequest`(`Call,` `int`)
`void` `onRttStatusChanged`(`Call,` `boolean, RttCall`)

Class android.telecom.Call.Callback