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android.telecom

The Android Telecom framework is responsible for managing calls on an Android device. This can include SIM-based calls using the Telephony framework, VOIP calls using SIP (e.g. the SipConnectionService), or via a third-party VOIP ConnectionService. Telecom acts as a switchboard, routing calls and audio focus between Connections provided by ConnectionService implementations, and InCallService implementations which provide a user interface for calls.

Android supports the following calling use cases (with increasing level of complexity):

Implement the self-managed ConnectionService API - this is ideal for developers of standalone calling apps which do not wish to show their calls within the default phone app, and do not wish to have other calls shown in their user interface. Using a self-managed ConnectionService implementation within your standalone calling app helps you ensure that your app will interoperate not only with native telephony calling on the device, but also other standalone calling apps implementing this API. It also manages audio routing and focus for you.
Implement the managed ConnectionService API - facilitates development of a calling solution that relies on the existing device phone application (see getDefaultDialerPackage()) to provide the user interface for calls. An example might be a third party implementation of SIP calling, or a VOIP calling service. A ConnectionService alone provides only the means of connecting calls, but has no associated user interface.
Implement the InCallService API - facilitates development of a replacement for the device's default Phone/Dialer app. The InCallService alone does not have any calling capability and consists of the user-interface side of calling only. An InCallService must handle all Calls the Telecom framework is aware of. It must not make assumptions about the nature of the calls (e.g. assuming calls are SIM-based telephony calls), and should not implement calling restrictions based on any one ConnectionService (e.g. it should not enforce Telephony restrictions for video calls).
Implement both the InCallService and ConnectionService API - ideal if you wish to create your own ConnectionService based calling solution, complete with its own full user interface, while showing all other Android calls in the same user interface. Using this approach, you must still ensure that your InCallService makes no assumption about the source of the calls it displays. You must also ensure that your ConnectionService implementation can still function without the default phone app being set to your custom InCallService.

Classes

Call	Represents an ongoing phone call that the in-call app should present to the user.
Call.Callback	Defines callbacks which inform the `InCallService` of changes to a `Call`.
Call.Details
Call.RttCall	A class that holds the state that describes the state of the RTT channel to the remote party, if it is active.
CallAudioState	Encapsulates the telecom audio state, including the current audio routing, supported audio routing and mute.
CallRedirectionService	This service can be implemented to interact between Telecom and its implementor for making outgoing call with optional redirection/cancellation purposes.
CallScreeningService	This service can be implemented by the default dialer (see `TelecomManager#getDefaultDialerPackage()`) or a third party app to allow or disallow incoming calls before they are shown to a user.
CallScreeningService.CallResponse	Information about how to respond to an incoming call.
CallScreeningService.CallResponse.Builder
Conference	Represents a conference call which can contain any number of `Connection` objects.
Conferenceable	Interface used to identify entities with which another entity can participate in a conference call with.
Connection	Represents a phone call or connection to a remote endpoint that carries voice and/or video traffic.
Connection.RttModifyStatus	Provides constants to represent the results of responses to session modify requests sent via `Call#sendRttRequest()`
Connection.RttTextStream	Provides methods to read and write RTT data to/from the in-call app.
Connection.VideoProvider	Provides a means of controlling the video session associated with a `Connection`.
ConnectionRequest	Simple data container encapsulating a request to some entity to create a new `Connection`.
ConnectionService	An abstract service that should be implemented by any apps which either: Can make phone calls (VoIP or otherwise) and want those calls to be integrated into the built-in phone app.
DisconnectCause	Describes the cause of a disconnected call.
GatewayInfo	Encapsulated gateway address information for outgoing call.
InCallService	This service is implemented by an app that wishes to provide functionality for managing phone calls.
InCallService.VideoCall	Used to issue commands to the `Connection.VideoProvider` associated with a `Call`.
InCallService.VideoCall.Callback	The `InCallService` extends this class to provide a means of receiving callbacks from the `Connection.VideoProvider`.
PhoneAccount	Represents a distinct method to place or receive a phone call.
PhoneAccount.Builder	Helper class for creating a `PhoneAccount`.
PhoneAccountHandle	The unique identifier for a `PhoneAccount`.
PhoneAccountSuggestion
RemoteConference	A conference provided to a `ConnectionService` by another `ConnectionService` through `ConnectionService#conferenceRemoteConnections`.
RemoteConference.Callback	Callback base class for `RemoteConference`.
RemoteConnection	A connection provided to a `ConnectionService` by another `ConnectionService` running in a different process.
RemoteConnection.Callback	Callback base class for `RemoteConnection`.
RemoteConnection.VideoProvider	`RemoteConnection.VideoProvider` associated with a `RemoteConnection`.
RemoteConnection.VideoProvider.Callback	Callback class used by the `RemoteConnection.VideoProvider` to relay events from the `Connection.VideoProvider`.
StatusHints	Contains status label and icon displayed in the in-call UI.
TelecomManager	Provides access to information about active calls and registration/call-management functionality.
VideoProfile	Represents attributes of video calls.
VideoProfile.CameraCapabilities	Represents the camera capabilities important to a Video Telephony provider.