# RemoteConnection.Callback
Added in[API level 23](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
# Callback
*** ** * ** ***
Kotlin\|[Java](https://developer.android.com/reference/android/telecom/RemoteConnection.Callback "View this page in Java")
```
abstract class Callback
```
|---|----------------------------------------------------------------------------------------------------------------------------------------|
| [kotlin.Any](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html) ||
| ↳ | [android.telecom.RemoteConnection.Callback](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection.Callback#) |
Callback base class for[RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection).
## Summary
| Public constructors ||
|----------------------------------------------------------------------------------------------------------------------------|---|
| [Callback](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection.Callback#Callback())`()`
|
| Public methods ||
|----------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| open[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onAddressChanged](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection.Callback#onAddressChanged(android.telecom.RemoteConnection,%20android.net.Uri,%20kotlin.Int))`(`connection:` `[RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!`, `address:` `[Uri](https://developer.android.com/reference/kotlin/android/net/Uri.html#)!`, `presentation:` `[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)`)` Indicates that the address (e.g., phone number) of this |
| open[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onCallerDisplayNameChanged](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection.Callback#onCallerDisplayNameChanged(android.telecom.RemoteConnection,%20kotlin.String,%20kotlin.Int))`(`connection:` `[RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!`, `callerDisplayName:` `[String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)!`, `presentation:` `[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)`)` Indicates that the caller display name of this`RemoteConnection`has changed. |
| open[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onConferenceChanged](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection.Callback#onConferenceChanged(android.telecom.RemoteConnection,%20android.telecom.RemoteConference))`(`connection:` `[RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!`, `conference:` `[RemoteConference](https://developer.android.com/reference/kotlin/android/telecom/RemoteConference)!`)` Indicates that the`RemoteConference`that this`RemoteConnection`is a part of has changed. |
| open[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onConferenceableConnectionsChanged](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection.Callback#onConferenceableConnectionsChanged(android.telecom.RemoteConnection,%20kotlin.collections.MutableList))`(`connection:` `[RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!`, `conferenceableConnections:` `[MutableList](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-mutable-list/index.html)<[RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!>!`)` Indicates that the`RemoteConnection`s with which this`RemoteConnection`may be asked to create a conference has changed. |
| open[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onConnectionCapabilitiesChanged](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection.Callback#onConnectionCapabilitiesChanged(android.telecom.RemoteConnection,%20kotlin.Int))`(`connection:` `[RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!`, `connectionCapabilities:` `[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)`)` Indicates that the call capabilities of this`RemoteConnection`have changed. |
| open[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onConnectionEvent](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection.Callback#onConnectionEvent(android.telecom.RemoteConnection,%20kotlin.String,%20android.os.Bundle))`(`connection:` `[RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!`, `event:` `[String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)!`, `extras:` `[Bundle](https://developer.android.com/reference/kotlin/android/os/Bundle.html#)!`)` Handles a connection event propagated to this[RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection). |
| open[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onConnectionPropertiesChanged](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection.Callback#onConnectionPropertiesChanged(android.telecom.RemoteConnection,%20kotlin.Int))`(`connection:` `[RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!`, `connectionProperties:` `[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)`)` Indicates that the call properties of this`RemoteConnection`have changed. |
| open[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onDestroyed](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection.Callback#onDestroyed(android.telecom.RemoteConnection))`(`connection:` `[RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!`)` Indicates that this`RemoteConnection`has been destroyed. |
| open[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onDisconnected](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection.Callback#onDisconnected(android.telecom.RemoteConnection,%20android.telecom.DisconnectCause))`(`connection:` `[RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!`, `disconnectCause:` `[DisconnectCause](https://developer.android.com/reference/kotlin/android/telecom/DisconnectCause)!`)` Invoked when this`RemoteConnection`is disconnected. |
| open[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onExtrasChanged](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection.Callback#onExtrasChanged(android.telecom.RemoteConnection,%20android.os.Bundle))`(`connection:` `[RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!`, `extras:` `[Bundle](https://developer.android.com/reference/kotlin/android/os/Bundle.html#)?`)` Handles changes to the`RemoteConnection`extras. |
| open[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onPostDialChar](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection.Callback#onPostDialChar(android.telecom.RemoteConnection,%20kotlin.Char))`(`connection:` `[RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!`, `nextChar:` `[Char](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-char/index.html)`)` Invoked when the post-dial sequence in the outgoing`Connection`has processed a character. |
| open[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onPostDialWait](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection.Callback#onPostDialWait(android.telecom.RemoteConnection,%20kotlin.String))`(`connection:` `[RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!`, `remainingPostDialSequence:` `[String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)!`)` Invoked when the post-dial sequence in the outgoing`Connection`has reached a pause character. |
| open[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onRingbackRequested](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection.Callback#onRingbackRequested(android.telecom.RemoteConnection,%20kotlin.Boolean))`(`connection:` `[RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!`, `ringback:` `[Boolean](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html)`)` Invoked when this`RemoteConnection`is requesting ringback. |
| open[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onStateChanged](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection.Callback#onStateChanged(android.telecom.RemoteConnection,%20kotlin.Int))`(`connection:` `[RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!`, `state:` `[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)`)` Invoked when the state of this`RemoteConnection`has changed. |
| open[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onStatusHintsChanged](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection.Callback#onStatusHintsChanged(android.telecom.RemoteConnection,%20android.telecom.StatusHints))`(`connection:` `[RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!`, `statusHints:` `[StatusHints](https://developer.android.com/reference/kotlin/android/telecom/StatusHints)!`)` Indicates that the status hints of this`RemoteConnection`have changed. |
| open[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onVideoProviderChanged](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection.Callback#onVideoProviderChanged(android.telecom.RemoteConnection,%20android.telecom.RemoteConnection.VideoProvider))`(`connection:` `[RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!`, `videoProvider:` `[RemoteConnection.VideoProvider](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection.VideoProvider)!`)` Indicates that the`VideoProvider`associated with this`RemoteConnection`has changed. |
| open[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onVideoStateChanged](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection.Callback#onVideoStateChanged(android.telecom.RemoteConnection,%20kotlin.Int))`(`connection:` `[RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!`, `videoState:` `[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)`)` Indicates that the video state of this`RemoteConnection`has changed. |
| open[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onVoipAudioChanged](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection.Callback#onVoipAudioChanged(android.telecom.RemoteConnection,%20kotlin.Boolean))`(`connection:` `[RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!`, `isVoip:` `[Boolean](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html)`)` Indicates that the VOIP audio status of this`RemoteConnection`has changed. |
## Public constructors
### Callback
```
Callback()
```
## Public methods
### onAddressChanged
Added in[API level 23](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
open fun onAddressChanged(
connection: RemoteConnection!,
address: Uri!,
presentation: Int
): Unit
```
Indicates that the address (e.g., phone number) of this`RemoteConnection`has changed. See[getAddress()](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection#getAddress())and[getAddressPresentation()](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection#getAddressPresentation()).
| Parameters ||
|----------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `connection` | [RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!:The`RemoteConnection`invoking this method. |
| `address` | [Uri](https://developer.android.com/reference/kotlin/android/net/Uri.html#)!:The new address of the`RemoteConnection`. |
| `presentation` | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html):The presentation requirements for the address. See[TelecomManager](https://developer.android.com/reference/kotlin/android/telecom/TelecomManager)for valid values. |
### onCallerDisplayNameChanged
Added in[API level 23](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
open fun onCallerDisplayNameChanged(
connection: RemoteConnection!,
callerDisplayName: String!,
presentation: Int
): Unit
```
Indicates that the caller display name of this`RemoteConnection`has changed. See[getCallerDisplayName()](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection#getCallerDisplayName())and[getCallerDisplayNamePresentation()](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection#getCallerDisplayNamePresentation()).
| Parameters ||
|---------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `connection` | [RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!:The`RemoteConnection`invoking this method. |
| `callerDisplayName` | [String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)!:The new caller display name of the`RemoteConnection`. |
| `presentation` | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html):The presentation requirements for the handle. See[TelecomManager](https://developer.android.com/reference/kotlin/android/telecom/TelecomManager)for valid values. |
### onConferenceChanged
Added in[API level 23](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
open fun onConferenceChanged(
connection: RemoteConnection!,
conference: RemoteConference!
): Unit
```
Indicates that the`RemoteConference`that this`RemoteConnection`is a part of has changed.
| Parameters ||
|--------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `connection` | [RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!:The`RemoteConnection`invoking this method. |
| `conference` | [RemoteConference](https://developer.android.com/reference/kotlin/android/telecom/RemoteConference)!:The`RemoteConference`of which this`RemoteConnection`is a part, which may be`null`. |
### onConferenceableConnectionsChanged
Added in[API level 23](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
open fun onConferenceableConnectionsChanged(
connection: RemoteConnection!,
conferenceableConnections: MutableList!
): Unit
```
Indicates that the`RemoteConnection`s with which this`RemoteConnection`may be asked to create a conference has changed.
| Parameters ||
|-----------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `connection` | [RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!:The`RemoteConnection`invoking this method. |
| `conferenceableConnections` | [MutableList](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-mutable-list/index.html)\<[RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!\>!:The`RemoteConnection`s with which this`RemoteConnection`may be asked to create a conference. |
### onConnectionCapabilitiesChanged
Added in[API level 23](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
open fun onConnectionCapabilitiesChanged(
connection: RemoteConnection!,
connectionCapabilities: Int
): Unit
```
Indicates that the call capabilities of this`RemoteConnection`have changed. See[getConnectionCapabilities()](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection#getConnectionCapabilities()).
| Parameters ||
|--------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------|
| `connection` | [RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!:The`RemoteConnection`invoking this method. |
| `connectionCapabilities` | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html):The new capabilities of the`RemoteConnection`. |
### onConnectionEvent
Added in[API level 25](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
open fun onConnectionEvent(
connection: RemoteConnection!,
event: String!,
extras: Bundle!
): Unit
```
Handles a connection event propagated to this[RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection).
Connection events originate from[Connection.sendConnectionEvent(String, Bundle)](https://developer.android.com/reference/kotlin/android/telecom/Connection#sendConnectionEvent(kotlin.String,%20android.os.Bundle)).
| Parameters ||
|--------------|-------------------------------------------------------------------------------------------------------------------------------------------------|
| `connection` | [RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!:The`RemoteConnection`invoking this method. |
| `event` | [String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)!:The connection event. |
| `extras` | [Bundle](https://developer.android.com/reference/kotlin/android/os/Bundle.html#)!:Extras associated with the event. |
### onConnectionPropertiesChanged
Added in[API level 25](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
open fun onConnectionPropertiesChanged(
connection: RemoteConnection!,
connectionProperties: Int
): Unit
```
Indicates that the call properties of this`RemoteConnection`have changed. See[getConnectionProperties()](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection#getConnectionProperties()).
| Parameters ||
|------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------|
| `connection` | [RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!:The`RemoteConnection`invoking this method. |
| `connectionProperties` | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html):The new properties of the`RemoteConnection`. |
### onDestroyed
Added in[API level 23](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
open fun onDestroyed(connection: RemoteConnection!): Unit
```
Indicates that this`RemoteConnection`has been destroyed. No further requests should be made to the`RemoteConnection`, and references to it should be cleared.
| Parameters ||
|--------------|-------------------------------------------------------------------------------------------------------------------------------------------------|
| `connection` | [RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!:The`RemoteConnection`invoking this method. |
### onDisconnected
Added in[API level 23](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
open fun onDisconnected(
connection: RemoteConnection!,
disconnectCause: DisconnectCause!
): Unit
```
Invoked when this`RemoteConnection`is disconnected.
| Parameters ||
|-------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `connection` | [RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!:The`RemoteConnection`invoking this method. |
| `disconnectCause` | [DisconnectCause](https://developer.android.com/reference/kotlin/android/telecom/DisconnectCause)!:The ({@see DisconnectCause}) associated with this failed connection. |
### onExtrasChanged
Added in[API level 23](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
open fun onExtrasChanged(
connection: RemoteConnection!,
extras: Bundle?
): Unit
```
Handles changes to the`RemoteConnection`extras.
| Parameters ||
|--------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `connection` | [RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!:The`RemoteConnection`invoking this method. |
| `extras` | [Bundle](https://developer.android.com/reference/kotlin/android/os/Bundle.html#)?:The extras containing other information associated with the connection. This value may be`null`. |
### onPostDialChar
Added in[API level 23](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
open fun onPostDialChar(
connection: RemoteConnection!,
nextChar: Char
): Unit
```
Invoked when the post-dial sequence in the outgoing`Connection`has processed a character.
| Parameters ||
|--------------|-------------------------------------------------------------------------------------------------------------------------------------------------|
| `connection` | [RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!:The`RemoteConnection`invoking this method. |
| `nextChar` | [Char](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-char/index.html):The character being processed. |
### onPostDialWait
Added in[API level 23](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
open fun onPostDialWait(
connection: RemoteConnection!,
remainingPostDialSequence: String!
): Unit
```
Invoked when the post-dial sequence in the outgoing`Connection`has reached a pause character. This causes the post-dial signals to stop pending user confirmation. An implementation should present this choice to the user and invoke[RemoteConnection.postDialContinue(boolean)](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection#postDialContinue(kotlin.Boolean))when the user makes the choice.
| Parameters ||
|-----------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------|
| `connection` | [RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!:The`RemoteConnection`invoking this method. |
| `remainingPostDialSequence` | [String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)!:The post-dial characters that remain to be sent. |
### onRingbackRequested
Added in[API level 23](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
open fun onRingbackRequested(
connection: RemoteConnection!,
ringback: Boolean
): Unit
```
Invoked when this`RemoteConnection`is requesting ringback. See[isRingbackRequested()](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection#isRingbackRequested()).
| Parameters ||
|--------------|-------------------------------------------------------------------------------------------------------------------------------------------------|
| `connection` | [RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!:The`RemoteConnection`invoking this method. |
| `ringback` | [Boolean](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html):Whether the`RemoteConnection`is requesting ringback. |
### onStateChanged
Added in[API level 23](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
open fun onStateChanged(
connection: RemoteConnection!,
state: Int
): Unit
```
Invoked when the state of this`RemoteConnection`has changed. See[getState()](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection#getState()).
| Parameters ||
|--------------|-------------------------------------------------------------------------------------------------------------------------------------------------|
| `connection` | [RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!:The`RemoteConnection`invoking this method. |
| `state` | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html):The new state of the`RemoteConnection`. |
### onStatusHintsChanged
Added in[API level 23](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
open fun onStatusHintsChanged(
connection: RemoteConnection!,
statusHints: StatusHints!
): Unit
```
Indicates that the status hints of this`RemoteConnection`have changed. See[getStatusHints()](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection#getStatusHints())()}.
| Parameters ||
|---------------|-------------------------------------------------------------------------------------------------------------------------------------------------|
| `connection` | [RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!:The`RemoteConnection`invoking this method. |
| `statusHints` | [StatusHints](https://developer.android.com/reference/kotlin/android/telecom/StatusHints)!:The new status hints of the`RemoteConnection`. |
### onVideoProviderChanged
Added in[API level 23](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
open fun onVideoProviderChanged(
connection: RemoteConnection!,
videoProvider: RemoteConnection.VideoProvider!
): Unit
```
Indicates that the`VideoProvider`associated with this`RemoteConnection`has changed.
| Parameters ||
|-----------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `connection` | [RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!:The`RemoteConnection`invoking this method. |
| `videoProvider` | [RemoteConnection.VideoProvider](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection.VideoProvider)!:The new`VideoProvider`associated with this`RemoteConnection`. |
### onVideoStateChanged
Added in[API level 23](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
open fun onVideoStateChanged(
connection: RemoteConnection!,
videoState: Int
): Unit
```
Indicates that the video state of this`RemoteConnection`has changed. See[getVideoState()](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection#getVideoState()).
| Parameters ||
|--------------|-------------------------------------------------------------------------------------------------------------------------------------------------|
| `connection` | [RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!:The`RemoteConnection`invoking this method. |
| `videoState` | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html):The new video state of the`RemoteConnection`. |
### onVoipAudioChanged
Added in[API level 23](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
open fun onVoipAudioChanged(
connection: RemoteConnection!,
isVoip: Boolean
): Unit
```
Indicates that the VOIP audio status of this`RemoteConnection`has changed. See[isVoipAudioMode()](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection#isVoipAudioMode()).
| Parameters ||
|--------------|-------------------------------------------------------------------------------------------------------------------------------------------------|
| `connection` | [RemoteConnection](https://developer.android.com/reference/kotlin/android/telecom/RemoteConnection)!:The`RemoteConnection`invoking this method. |
| `isVoip` | [Boolean](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html):Whether the new audio state of the`RemoteConnection`is VOIP. |