Classes

TVOAcceptOptionsBuilder is a builder class for TVOAcceptOptions.

@discussion Accept options builder to use when accepting a call. For example:

  let acceptOptions = TVOAcceptOptions(callInvite: callInvite) { builder in
      builder.uuid = callInvite.uuid
      builder.enableIceGatheringOnAnyAddressPorts = true
  }

  let call = callInvite.accept(with: acceptOptions, delegate: self)

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@interface TVOAcceptOptionsBuilder : TVOCallOptionsBuilder

class TVOAcceptOptionsBuilder : TVOCallOptionsBuilder

@brief TVOAcceptOptions represents a custom configuration to use when accepting an incoming Call.

@discussion Accept options builder to use when accepting a call. For example:

  let acceptOptions = TVOAcceptOptions(callInvite: callInvite) { builder in
      builder.uuid = callInvite.uuid
      builder.enableIceGatheringOnAnyAddressPorts = true
  }

  let call = callInvite.accept(with: acceptOptions, delegate: self)

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@interface TVOAcceptOptions : TVOCallOptions

class TVOAcceptOptions : TVOCallOptions

TVOAudioCodec is the base class for all supported audio codecs.

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@interface TVOAudioCodec : NSObject

class TVOAudioCodec : NSObject

TVOAudioFormat describes audio that is captured or rendered via a TVOAudioDevice. The class also offers convenience methods to help interoperate with CoreAudio and size your audio buffers appropriately.

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@interface TVOAudioFormat : NSObject

class TVOAudioFormat : NSObject

TVOAudioOptionsBuilder constructs TVOAudioOptions.

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@interface TVOAudioOptionsBuilder : NSObject

class TVOAudioOptionsBuilder : NSObject

TVOAudioOptions specifies options for TVOLocalAudioTrack.

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@interface TVOAudioOptions : NSObject

class TVOAudioOptions : NSObject

TVOBaseTrackStats represents stats common to both local and remote tracks.

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@interface TVOBaseTrackStats : NSObject

class TVOBaseTrackStats : NSObject

The TVOCall class represents a signaling and media session between the host device and Twilio infrastructure. Calls can represent an outbound call initiated from the SDK via <[TwilioVoiceSDK connectWithAccessToken:delegate:]> or an incoming call accepted via a <[TVOCallInvite acceptWithDelegate:]>. Devices that initiate an outbound call represent the caller and devices that receive a <TVOCallInvite> represent the callee.

The lifecycle of a call differs for the caller and the callee. Making or accepting a call requires a <TVOCallDelegate> which receives call state changes defined in <TVOCallState>. The <TVOCallState> can be obtained at any time from the state property of TVOCall.

The caller callback behavior is affected by the answerOnBridge flag provided in the Dial verb of your TwiML application associated with this client. If the answerOnBridge flag is false, which is the default, the <[TVOCallDelegate callDidConnect:]> callback will be emitted immediately after <[TVOCallDelegate callDidStartRinging:]>. If the answerOnBridge flag is true this will cause the call to emit the <[TVOCallDelegate callDidConnect:]> callback only until the call is answered. See Answer on Bridge documentation for more details on how to use it with the Dial TwiML verb.

The following table provides expected call sequences for common scenarios from the perspective of the caller:

Scenario	`` Callbacks	`` Transitions
A call is initiated and the caller disconnects before reaching the ringing state.	`<[TVOCallDelegate call:didDisconnectWithError:]>`	`TVOCallStateConnecting` `TVOCallStateDisconnected`
A call is initiated, reaches the ringing state and the caller disconnects before being connected.	`<[TVOCallDelegate callDidStartRinging:]>` `<[TVOCallDelegate call:didDisconnectWithError:]>`	`TVOCallStateConnecting` `TVOCallStateRinging` `TVOCallStateDisconnected`
A call is initiated and the call fails to connect before reaching the ringing state.	`<[TVOCallDelegate call:didFailToConnectWithError:]>`	`TVOCallStateConnecting` `TVOCallStateDisconnected`
A call is initiated and the call fails to connect after reaching the ringing state.	`<[TVOCallDelegate callDidStartRinging:]>` `<[TVOCallDelegate call:didFailToConnectWithError:]>`	`TVOCallStateConnecting` `TVOCallStateRinging` `TVOCallStateDisconnected`
A call is initiated, becomes connected, and ends for one of the following reasons: The caller disconnects the call The callee disconnects the call An on-device error occurs. (eg. network loss) An error between the caller and callee occurs. (eg. media connection lost or Twilio infrastructure failure)	`<[TVOCallDelegate callDidStartRinging:]>` `<[TVOCallDelegate callDidConnect:]>` `<[TVOCallDelegate call:didDisconnectWithError:]>`	`TVOCallStateConnecting` `TVOCallStateRinging` `TVOCallStateConnected` `TVOCallStateDisconnected`

The following table provides expected call sequences for common scenarios from the callee perspective:

Scenario	`` Callbacks	`` Transitions
A `` is accepted and the callee disconnects the call before being connected.	`<[TVOCallDelegate call:didDisconnectWithError:]>`	`TVOCallStateConnecting` `TVOCallStateDisconnected`
A `` is accepted and the call fails to connect.	`<[TVOCallDelegate call:didFailToConnectWithError:]>`	`TVOCallStateConnecting` `TVOCallStateDisconnected`
A `` is accepted, becomes connected, and ends for one of the following reasons: The caller disconnects the call The callee disconnects the call An on-device error occurs. (eg. network loss) An error between the caller and callee occurs. (eg. media connection lost or Twilio infrastructure failure)	`<[TVOCallDelegate callDidStartRinging:]>` `<[TVOCallDelegate callDidConnect:]>` `<[TVOCallDelegate call:didDisconnectWithError:]>`	`TVOCallStateConnecting` `TVOCallStateRinging` `TVOCallStateConnected` `TVOCallStateDisconnected`

It is important to call the <[TVOCall disconnect]> method to terminate the call. Not calling <[TVOCall disconnect]> results in leaked native resources and may lead to an out-of-memory crash. If the call is disconnected by the caller, callee, or Twilio, the SDK will automatically free native resources. However, <[TVOCall disconnect]> is an idempotent operation so it is best to call this method when you are certain your application no longer needs the object.

It is strongly recommended that <TVOCall> instances are created and accessed from a single dispatch queue. Accessing a <TVOCall> instance from multiple queues may cause synchronization problems. <TVOCallDelegate> methods are called on the main dispatch queue by default or on the delegateQueue provided to <TVOConnectOptions> or <TVOAcceptOptions> upon initiating or accepting a call.

An ongoing call will automatically switch to a more preferred network type if one becomes available. The following are the network types listed in preferred order: ETHERNET, LOOPBACK, WIFI, VPN, and CELLULAR. For example, if a WIFI network becomes available whilst in a call that is using CELLULAR data, the call will automatically switch to using the WIFI network.

Media and signaling reconnections are handled independently. As a result, it is possible that a single network change event produces consecutive [TVOCallDelegate call:isReconnectingWithError:] and [TVOCallDelegate callDidReconnect:] callbacks. For example, a network change may result in the following callback sequence.

• [TVOCallDelegate call:isReconnectingWithError:] with error.code TVOErrorSignalingConnectionDisconnectedError.
• [TVOCallDelegate callDidReconnect:].
• [TVOCallDelegate call:isReconnectingWithError:] with error.code TVOErrorMediaConnectionError.
• [TVOCallDelegate callDidReconnect:].

Note that the SDK will always raise a [TVOCallDelegate call:isReconnectingWithError:] callback followed by a [TVOCallDelegate callDidReconnect:] callback when reconnection is successful.

During the reconnecting state operations such as [TVOCall setOnHold:], [TVOCall setMuted:], [TVOCall sendDigits:] will result in undefined behavior. When building applications, the recommended practice is to show a UI update when the Call enters reconnecting regardless of the cause, and then clear the UI update once the call has reconnected or disconnected.

Insights

The following connection events are reported to Insights during a call:

Group Name	Event Name	Description	Since version
connection	muted	Audio input of the call is muted by calling `<[TVOCall setMuted:]>` with `YES`.	3.0.0-beta2
connection	unmuted	Audio input of the call is unmuted by calling `<[TVOCall setMuted:]>` with `NO`.	3.0.0-beta2
connection	accepted-by-remote	Server returns an answer to the Client’s offer over the signaling channel.	3.0.0-beta2
connection	ringing	Call state transitions to `TVOCallStateRinging`.	3.0.0-beta2
connection	connected	Call state transitions to `TVOCallStateConnected`.	3.0.0-beta2
connection	disconnect-called	`<[TVOCall disconnect]>` is called.	3.0.0-beta2
connection	disconnected-by-local	Call disconnected as a result of calling `<[TVOCall disconnect]>`. Call transitions to `TVOCallStateDisconnected`.	3.0.0-beta2
connection	disconnected-by-remote	Call is disconnected by the remote. Call transitions to `TVOCallStateDisconnected`.	3.0.0-beta2
connection	hold	Call is on hold by calling `<[TVOCall setOnHold:]>` with `YES`.	3.0.0-beta2
connection	unhold	Call is on unhold by calling `<[TVOCall setOnHold:]>` with `NO`.	3.0.0-beta2
connection	error	Error description. Call state transitions to `TVOCallStateDisconnected`.	3.0.0-beta2
connection	reconnecting	The Call is attempting to recover from a signaling or media connection interruption	3.0.0-beta3
connection	reconnected	The Call has recovered from a signaling or media connection interruption	3.0.0-beta3

The following peer connection state events are reported to Insights during a call:

Group Name	Event Name	Description	Since version
pc-connection-state	new	The PeerConnection ice connection state changed to “new”.	6.0.0
pc-connection-state	connecting	The PeerConnection state changed to “connecting”.	6.0.0
pc-connection-state	connected	The PeerConnection state changed to “connected”.	6.0.0
pc-connection-state	disconnected	The PeerConnection state changed to “disconnected”.	6.0.0
pc-connection-state	failed	The PeerConnection state changed to “failed”.	6.0.0
pc-connection-state	closed	The PeerConnection state changed to “closed”.	6.0.0

The following ICE candidate event is reported to Insights during a call:

Group Name	Event Name	Description	Since version
ice-candidate	ice-candidate	ICE candidate events are raised when `OnIceCandidate` is called on the `PeerConnection`	4.1.0
ice-candidate	selected-ice-candidate-pair	The active local ICE candidate and remote ICE candidate	6.0.0

The following ICE connection state events are reported to Insights during a call:

Group Name	Event Name	Description	Since version
ice-connection-state	new	The PeerConnection ice connection state changed to “new”.	3.0.0-beta3
ice-connection-state	checking	The PeerConnection ice connection state changed to “checking”.	3.0.0-beta3
ice-connection-state	connected	The PeerConnection ice connection state changed to “connected”.	3.0.0-beta3
ice-connection-state	completed	The PeerConnection ice connection state changed to “completed”.	3.0.0-beta3
ice-connection-state	closed	The PeerConnection ice connection state changed to “closed”.	3.0.0-beta3
ice-connection-state	disconnected	The PeerConnection ice connection state changed to “disconnected”.	3.0.0-beta3
ice-connection-state	failed	The PeerConnection ice connection state changed to “failed”.	3.0.0-beta3

The following ICE gathering state events are reported to Insights during a call:

Group Name	Event Name	Description	Since version
ice-gathering-state	new	The PeerConnection ice gathering state changed to “new”.	3.0.0-beta3
ice-gathering-state	gathering	The PeerConnection ice gathering state changed to “checking”.	3.0.0-beta3
ice-gathering-state	complete	The PeerConnection ice gathering state changed to “connected”.	3.0.0-beta3

The following signaling state events are reported to Insights during a call:

Group Name	Event Name	Description	Since version
signaling-state	stable	The PeerConnection signaling state changed to “stable”.	3.0.0-beta3
signaling-state	have-local-offer	The PeerConnection signaling state changed to “have-local-offer”.	3.0.0-beta3
signaling-state	have-remote-offers	The PeerConnection signaling state changed to “have-remote-offers”.	3.0.0-beta3
signaling-state	have-local-pranswer	The PeerConnection signaling state changed to “have-local-pranswer”.	3.0.0-beta3
signaling-state	have-remote-pranswer	The PeerConnection signaling state changed to “have-remote-pranswer”.	3.0.0-beta3
signaling-state	closed	The PeerConnection signaling state changed to “closed”.	3.0.0-beta3

The following network quality warning and network quality warning cleared events are reported to Insights during a call:

Group Name	Event Name	Description	Since version
network-quality-warning-raised	high-jitter	Three out of last five jitter samples exceed 30 ms.	3.0.0-beta3
network-quality-warning-cleared	high-jitter	high-jitter warning cleared if last five jitter samples are less than 30 ms.	3.0.0-beta3
network-quality-warning-raised	low-mos	Three out of last five mos samples are lower than 3.5.	3.0.0-beta3
network-quality-warning-cleared	low-mos	low-mos cleared if last five mos samples are higher than 3.5.	3.0.0-beta3
network-quality-warning-raised	high-packets-lost-fraction	The average packet loss > 3% in last 7 samples.	3.0.0-beta3
network-quality-warning-cleared	high-packets-lost-fraction	high-packets-lost-fraction cleared if average packet loss <= 1% in last 7 samples.	3.0.0-beta3
network-quality-warning-raised	high-rtt	Three out of last five RTT samples show greater than 400 ms.	3.0.0-beta3
network-quality-warning-cleared	high-rtt	high-rtt warning cleared if last five RTT samples are lower than 400 ms.	3.0.0-beta3

The following audio level warning and audio level warning cleared events are reported to Insights during a call

Group Name	Event Name	Description	Since version
audio-level-warning-raised	constant-audio-input-level	The standard deviation of audio input levels for last 10 samples is less than or equals 1% of the maximum possible audio input level (32767) i.e. 327.67 and the call is not in the muted state	3.0.0-beta3
audio-level-warning-cleared	constant-audio-input-level	constant-audio-input-level warning cleared if the standard deviation of audio input levels for last 10 samples is greater than 3% of the maximum possible audio input level.	3.0.0-beta3
audio-level-warning-raised	constant-audio-output-level	The standard deviation of audio output levels for last 10 samples is less than or equals 1% of the maximum possible audio output level (32767) i.e. 327.67 and the local call is not placed on hold	6.11.0
audio-level-warning-cleared	constant-audio-output-level	constant-audio-output-level warning cleared if the standard deviation of audio output levels for last 10 samples is greater than 3% of the maximum possible audio output level.	6.11.0

The following feedback events are reported to Insights during a call:

Group Name	Event Name	Description	Since version
feedback	received	`<[TVOCall postFeedback:issue:]>` is called if the score is not `TVOCallFeedbackScoreNotReported` or the issue type is not `TVOCallFeedbackIssueNotReported`.	3.0.0-beta3
feedback	received-none	`<[TVOCall postFeedback:issue:]>` is called if the score is `TVOCallFeedbackScoreNotReported` and the issue type is `TVOCallFeedbackIssueNotReported`.	3.0.0-beta3

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@interface TVOCall : NSObject

class TVOCall : NSObject

The TVOCallInvite object represents an incoming Call Invite. TVOCallInvites are not created directly; they are returned by the <[TVONotificationDelegate callInviteReceived:]> delegate method.

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@interface TVOCallInvite : NSObject

class TVOCallInvite : NSObject

TVOCallMessageBuilder is a builder class for TVOCallMessage.

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@interface TVOCallMessageBuilder : NSObject

class TVOCallMessageBuilder : NSObject

@brief TVOCallMessage represents the in-call message and its configuration.

@discussion Message builder to use when using the [TVOCall sendMessage:] method. Example:

  let messageContent = "{\"foo\": \"bar\"}"
  let callMessage = CallMessage(content: messageContent, messageType: "user-defined-message")

  let voiceEventSid = call.sendMessage(callMessage)

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@interface TVOCallMessage : NSObject

class TVOCallMessage : NSObject

TVOCallOptionsBuilder is a builder class for TVOCallOptions.

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@interface TVOCallOptionsBuilder : NSObject

class TVOCallOptionsBuilder : NSObject

Represents options available when connecting to a Call. Normally, this class is not used directly. See TVOConnectOptions or TVOCAcceptOptions for example usage.

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@interface TVOCallOptions : NSObject

class TVOCallOptions : NSObject

@brief A TVOCallerInfo is used to represent the SHAKEN/STIR status information about the caller. TVOCallerInfo is not created directly; use the TVOCallInvite.callerInfo property instead.

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@interface TVOCallerInfo : NSObject

class TVOCallerInfo : NSObject

The TVOCancelledCallInvite object represents a cancelled incoming Call Invite. TVOCancelledCallInvites are not created directly; they are returned by the <[TVONotificationDelegate cancelledCallInviteReceived:error:]> delegate method.

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@interface TVOCancelledCallInvite : NSObject

class TVOCancelledCallInvite : NSObject

TVOConnectOptionsBuilder is a builder class for TVOConnectOptions.

@discussion Connect options builder to use when connecting. For example:

  let connectOptions = TVOConnectOptions(accessToken: accessToken) { builder in
      builder.params = ["to": "bob"]
      builder.enableIceGatheringOnAnyAddressPorts = true
  }

  let call = TwilioVoiceSDK.connect(with: connectOptions, delegate: callDelegate)

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@interface TVOConnectOptionsBuilder : TVOCallOptionsBuilder

class TVOConnectOptionsBuilder : TVOCallOptionsBuilder

@brief TVOConnectOptions represents a custom configuration to use when connecting a Call.

@discussion Connect options builder to use when connecting. For example:

  let connectOptions = TVOConnectOptions(accessToken: accessToken) { builder in
      builder.params = ["to": "bob"]
      builder.enableIceGatheringOnAnyAddressPorts = true
  }

  let call = TwilioVoiceSDK.connect(with: connectOptions, delegate: callDelegate)

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@interface TVOConnectOptions : TVOCallOptions

class TVOConnectOptions : TVOCallOptions

TVODefaultAudioDevice allows you to record and playback audio when you are connected to a Call.

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@interface TVODefaultAudioDevice : NSObject <TVOAudioDevice>

class TVODefaultAudioDevice : NSObject, TVOAudioDevice

TVODefaultLogger allows you to send your app to the default logger.

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@interface TVODefaultLogger : NSObject <TVOLogger>

class TVODefaultLogger : NSObject, TVOLogger

TVOIceCandidatePairStats reflects the properties of a Ice candidate pair

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@interface TVOIceCandidatePairStats : NSObject

class TVOIceCandidatePairStats : NSObject

TVOIceCandidateStats reflects the properties of a candidate in Section 15.1 in [RFC5245].

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@interface TVOIceCandidateStats : NSObject

class TVOIceCandidateStats : NSObject

TVOIceServer is a single STUN or TURN server.

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@interface TVOIceServer : NSObject

class TVOIceServer : NSObject

@brief TVOIceOptionsBuilder constructs TVOIceOptions.

@discussion If you provide a transportPolicy but do not provide any ICE Servers, then the servers will automatically be fetched for you based upon how the Call was created. For Client created Calls the default Call settings are used, while settings are provided on a per-Call basis when creating Calls using the REST API.

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@interface TVOIceOptionsBuilder : NSObject

class TVOIceOptionsBuilder : NSObject

TVOIceOptions specifies custom media connectivity configurations.

@discussion Media connections are established using the ICE (Interactive Connectivity Establishment) protocol. These options allow you to customize how data flows to and from participants, and which protocols to use. You may also provide your own ICE servers, overriding the defaults. https://www.twilio.com/stun-turn

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@interface TVOIceOptions : NSObject

class TVOIceOptions : NSObject

TVOLocalAudioTrackStats represents stats about a local audio track.

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@interface TVOLocalAudioTrackStats : TVOLocalTrackStats

class TVOLocalAudioTrackStats : TVOLocalTrackStats

TVOLocalTrackStats represents stats common to local tracks.

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@interface TVOLocalTrackStats : TVOBaseTrackStats

class TVOLocalTrackStats : TVOBaseTrackStats

A struct used to pass logging parameters to the log method in <TVOLogger>.

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@interface TVOLogParameters : NSObject

class TVOLogParameters : NSObject

@brief Lossy audio coding format.

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@interface TVOOpusCodec : TVOAudioCodec

class TVOOpusCodec : TVOAudioCodec

@brief ITU-T standard for audio companding.

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@interface TVOPcmuCodec : TVOAudioCodec

class TVOPcmuCodec : TVOAudioCodec

Undocumented

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@interface TVOPreflightTest : NSObject

/**
 * @name Properties
 */

/**
 * @brief The current state of the preflight test.
 */
@property (nonatomic, assign, readonly) TVOPreflightTestStatus status;

/**
 * @brief The call SID for the preflight test call.
 */
@property (nonatomic, strong, readonly, nonnull) NSString *callSid;

/**
 * @brief Preflight test start time. Unix timestamp in milliseconds.
 */
@property (nonatomic, assign, readonly) CFTimeInterval startTime;

/**
 * @brief Preflight test end time. Unix timestamp in milliseconds.
 */
@property (nonatomic, assign, readonly) CFTimeInterval endTime;

/** 
 * @brief The preflight test report.
 *
 * @discussion If accessed when the preflight status is anything other than `TVOPreflightTestStatusCompleted`,
 * an empty report object will be returned.
 */
@property (nonatomic, strong, readonly, nullable) TVOPreflightReport *preflightReport;

/**
 * @brief Returns the latest stats sample for the preflight test.
 */
@property (nonatomic, strong, readonly, nullable) TVOPreflightStatsSample *latestSample;

/**
 * @name Preflight Test Actions
 */

/**
 * @brief Stops the ongoing preflight test.
 * This will result in preflight test to be in `TVOPreflightTestStatusFailed` state.
 */
- (void)stop;

@end

class TVOPreflightTest : NSObject

TVOPreflightOptionsBuilder is a builder class for TVOPreflightOptions.

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@interface TVOPreflightOptionsBuilder : NSObject

class TVOPreflightOptionsBuilder : NSObject

Represents options available when running a preflight test.

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@interface TVOPreflightOptions : NSObject

class TVOPreflightOptions : NSObject

TVOPreflightTimeMeasurement is used to keep track of signaling connection time, peer connection time, ice connection time and preflight test time.

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@interface TVOPreflightTimeMeasurement : NSObject

class TVOPreflightTimeMeasurement : NSObject

TVOPreflightNetworkTiming is used to keep track of start time, end time, and duration of signaling connection time, peer connection time, ice connection time and preflight test time.

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@interface TVOPreflightNetworkTiming : NSObject

class TVOPreflightNetworkTiming : NSObject

TVOPreflightStatsSample stores a subset of relevant stats data from WebRTC provided stats.

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@interface TVOPreflightStatsSample : NSObject

class TVOPreflightStatsSample : NSObject

TVOPreflightAggregateStats stores the minimum, maximum, and average value of stats parameters.

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@interface TVOPreflightAggregateStats : NSObject

class TVOPreflightAggregateStats : NSObject

TVOPreflightNetworkStats stores the minimum, maximum, and average value of jitter, mos, and rtt as TVOPreflightAggregateStats objects.

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@interface TVOPreflightNetworkStats : NSObject

class TVOPreflightNetworkStats : NSObject

TVOPreflightWarning stores the call quality warning or audio level warning parameters received during the test.

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@interface TVOPreflightWarning : NSObject

class TVOPreflightWarning : NSObject

TVOPreflightWarningCleared stores the name of the call quality warning or audio level warning that was raised during the test and subsequently cleared.

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@interface TVOPreflightWarningCleared : NSObject

class TVOPreflightWarningCleared : NSObject

TVOPreflightIceCandidate stores the ICE candidates gathered during ice negotiation.

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@interface TVOPreflightIceCandidate : NSObject

class TVOPreflightIceCandidate : NSObject

TVOPreflightSelectedIceCandidatePair stores the selected local and remote ICE candidates used during the test. The values are stored as TVOPreflightIceCandidate objects.

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@interface TVOPreflightSelectedIceCandidatePair : NSObject

class TVOPreflightSelectedIceCandidatePair : NSObject

TVOPreflightReport contains the detailed report of the preflight test. This object is returned in the [TVOPreflightDelegate preflight:didCompleteWithReport:] callback when the preflight test is successfully completed.

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@interface TVOPreflightReport : NSObject

class TVOPreflightReport : NSObject

TVORemoteAudioTrackStats represents stats about a remote audio track.

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@interface TVORemoteAudioTrackStats : TVORemoteTrackStats

class TVORemoteAudioTrackStats : TVORemoteTrackStats

TVORemoteTrackStats represents stats common to remote tracks.

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@interface TVORemoteTrackStats : TVOBaseTrackStats

class TVORemoteTrackStats : TVOBaseTrackStats

TVOStatsReport contains stats for all tracks associated with a single peer connection.

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@interface TVOStatsReport : NSObject

class TVOStatsReport : NSObject

TwilioVoiceSDK is the entry point to the Twilio Voice SDK. You can register for VoIP push notifications, make outgoing Calls, receive Call invites and set audio device to use in a Call using this class.

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@interface TwilioVoiceSDK : NSObject

class TwilioVoiceSDK : NSObject