Here are the classes, structs, unions and interfaces with brief descriptions:

Nlinphone	Namespace that holds all liblinphone's API classes and enumerations
CAccount	Object that represents a Linphone Account
CAccountCreator	The object used to configure an account on a server via XML-RPC, see https://wiki.linphone.org/xwiki/wiki/public/view/Lib/Features/Override%20account%20creator%20request/
CAccountCreatorListener	An object to handle the responses callbacks for handling the AccountCreator operations
CAccountDevice	Object that represents a device that at least once was connected to a given account
CAccountListener	An object to handle the callbacks for the handling of Account objects
CAccountManagerServices	Creates and manage SIP user accounts remotely, using the REST API of the Flexisip Account Manager
CAccountManagerServicesRequest	Request object created by AccountManagerServices
CAccountManagerServicesRequestListener	An object to handle the callbacks for AccountManagerServicesRequest object
CAccountParams	Object that is used to set the different parameters of a Account
CAddress	Object that represents a parsed SIP address
CAlert	Object that represents an alert
CAlertListener	Object that represents a callback attached to an alert
CAudioDevice	Object holding audio device information
CAuthInfo	Object holding authentication information
CBearerToken	Object that represents a bearer token (eg OAUTH)
CBuffer	The object representing a data buffer
CCall	This object represents a call issued or received by the Core
CCallListener	That class holds all the callbacks which are called by Call objects
CCallLog	Object used to keep track of all calls initiated, received or missed
CCallParams	An object containing various parameters of a Call
CCallStats	This object carry various statistic informations regarding the quality of an audio or video stream for a given Call
CCardDavParams	The CardDavParams object represents a remote CardDAV server used by MagicSearch as a plugin source
CChatMessage	A ChatMessage represents an instant message that can be send or received through a ChatRoom
CChatMessageListener	An object to handle the callbacks for the handling a ChatMessage objects
CChatMessageReaction	A chat message reaction is an emoji sent by someone in the same chat room to react to a specific ChatMessage
CChatParams	Object defining settings strictly associated with ChatRoom objects such as ephemeral settings and backends
CChatRoom	A chat room is the place where ChatMessage are exchanged
CChatRoomListener	An object to handle the callbacks for the handling a ChatRoom objects
CChatRoomParams	Object defining parameters for a ChatRoom
CConference	A conference is the object that allow to make calls when there are 2 or more participants
CConferenceInfo	Object defining all information related to a past or future conference
CConferenceListener	An object to handle the callbacks for the handling a Conference objects
CConferenceParams	Object defining parameters for a Conference
CConferenceScheduler	Creates and manages conferences on a conferenceing service, and send conference invitations to notify participants
CConferenceSchedulerListener	Callbacks of ConferenceScheduler object
CConfig	This object is used to manipulate a configuration file
CContent	This object holds data that can be embedded in a signaling message or IM message
CCore	Main object to instanciate and on which to keep a reference
CCoreListener	That class holds all the callbacks which are called by Core
CDialPlan	Represents a dial plan
CDictionary	Object that represents key-value pair container
CDigestAuthenticationPolicy	The DigestAuthenticationPolicy holds parameters relative to digest authentication procedures
CEktInfo	Object representing all informations present in an Encrypted Key Transport event
CErrorInfo	Object representing full details about a signaling error or status
CEvent	Object representing an event state, which is subcribed or published
CEventListener	An object to handle the callbacks for handling the Event operations
CEventLog	Object that represents an event that must be stored in database
CFactory	The factory is a singleton object devoted to the creation of all the objects of Liblinphone that cannot be created by Core itself
CFriend	This object is used to store a SIP address
CFriendDevice	Object that represents a Friend's device (name, trust level) for a given SIP address
CFriendList	This object representing a list of Friend
CFriendListener	An object to handle the callbacks for Friend
CFriendListListener	An object to handle the callbacks for Friend synchronization
CFriendPhoneNumber	Object that represents a Friend's phone number
CHeaders	Object representing a chain of protocol headers
CImNotifPolicy	Policy to use to send/receive instant messaging composing/delivery/display notifications
CInfoMessage	Object representing an informational message sent or received by the core
CLdap	Object that represents a LDAP connection
CLdapParams	Object that is used to set the different parameters of a Ldap
CLoggingService	Singleton class giving access to logging features
CLoggingServiceListener	Listener for LoggingService
CMagicSearch	A MagicSearch is used to search for contacts from various sources:
CMagicSearchListener	MagicSearchListener is an interface to be notified of results of contact searches initiated from the MagicSearch
CMessageWaitingIndication	Object representing a Message Waiting Indication
CMessageWaitingIndicationSummary	Object representing the summary for a context in a Message Waiting Indication
CNatPolicy	Policy to use to pass through NATs/firewalls
CParticipant	Identifies a member of a Conference or ChatRoom
CParticipantDevice	This object represents a unique device for a member of a Conference or ChatRoom
CParticipantDeviceIdentity	This object is only used on server side for ChatRoom with ChatRoom::Backend::FlexisipChat backend
CParticipantDeviceListener	An object to handle the callbacks for the handling a ParticipantDevice objects
CParticipantImdnState	This object represents the delivery/display state of a given chat message for a given participant
CParticipantInfo	Object defining all information related to a participant
CPayloadType	Object representing an RTP payload type
CPlayer	Player interface
CPlayerListener	An object to handle the callbacks for the handling a Player objects
CPresenceActivity	Presence activity type holding information about a presence activity
CPresenceModel	Presence model type holding information about the presence of a person
CPresenceNote	Presence note type holding information about a presence note
CPresencePerson	Presence person holding information about a presence person
CPresenceService	Presence service type holding information about a presence service
CProxyConfig	Represents an account configuration to be used by Core
CPushNotificationConfig	Object holding push notification configuration that will be set in the contact URI parameters of the Contact header in the REGISTER, if the AccountParams is configured to allow push notifications, see AccountParams::setPushNotificationAllowed()
CPushNotificationMessage	Object holding chat message data received by a push notification on iOS platform only
CRange	Structure describing a range of integers
CRecorder	Interface used to record audio and video into files
CRecorderParams	Object containing various parameters of a Recorder
CRemoteContactDirectory	Object that represents a remote contact directory such as a LDAP or CardDAV server; used as a MagicSearch source
CSearchResult	The SearchResult object represents a result of a search initiated from a MagicSearch
CSignalInformation	Object to get signal (wifi/4G etc...) informations
CTransports	SIP transports & ports configuration object
CTunnel	Linphone tunnel object
CTunnelConfig	Tunnel settings
CVcard	Object storing contact information using vCard 4.0 format
CVideoActivationPolicy	Object describing policy regarding video streams establishments
CVideoDefinition	This object represents a video definition, eg
CVideoSourceDescriptor	Object that is used to describe a video source
CXmlRpcRequest	The XmlRpcRequest object representing a XML-RPC request to be sent
CXmlRpcRequestListener	An object to handle the callbacks for handling the XmlRpcRequest operations
CXmlRpcSession	The XmlRpcSession object used to send XML-RPC requests and handle their responses