Here is a list of all struct and union fields with links to the structures/unions they belong to:

### - u -

- ucf : H323GatekeeperURQ
- udpPorts : OpalManager
- Uganda : OpalLineInterfaceDevice
- Ukraine : OpalLineInterfaceDevice
- Unallocated : IAX2IeCauseCode
- UnallocatedNumber : Q931
- Unavailable : OpalPresenceInfo , SIPHandler
- Unchanged : OpalPresenceInfo
- UnCompressSubClass() : IAX2FullFrame
- Undefined : SDPMediaDescription
- undefType : IAX2Frame
- UninitialisedPhase : OpalConnection
- UnitedArabEmirates : OpalLineInterfaceDevice
- UnitedKingdom : OpalLineInterfaceDevice
- UnitedStates : OpalLineInterfaceDevice
- unkeyRadio : IAX2FullFrameSessionControl
- UnknownCauseIE : Q931
- UnknownCountry : OpalLineInterfaceDevice
- UnknownDirection : H323GatekeeperCall
- UnknownExtended : OpalPresenceInfo
- UnknownPlan : Q931
- UnknownType : Q931
- UnLockSinkTranscoder() : OpalMediaPatch
- Unregister() : H323RegisteredEndPoint , IAX2EndPoint , IAX2RegProcessor , SIPEndPoint
- UnregisterAll() : SIPEndPoint
- UnregisterCodecPlugins() : OpalPluginCodecManager
- Unregistered : IAX2IeCauseCode
- UnregisteredByGatekeeper : H323Gatekeeper
- UnregisteredError : IAX2EndPoint
- UnregisteredFailureUnknown : IAX2EndPoint
- UnregisteredLocally : H323Gatekeeper
- UnregistrationRequest() : H323Gatekeeper , H323GatekeeperListener
- Unsigned2String() : PluginCodec_MediaFormat
- Unsigned32 : OpalMediaOption::H245GenericInfo
- UnsignedInt : OpalMediaOption::H245GenericInfo
- UnsubcribeAll() : SIPEndPoint
- Unsubscribe() : SIPEndPoint
- UnsubscribeBuddyList() : OpalPresentity
- UnsubscribeBuddyListEx() : OpalPresentity
- Unsubscribed : SIPHandler
- UnsubscribeFromPresence() : OpalPresentity
- Unsubscribing : SIPHandler
- Update() : OpalMediaFormat , SIPDialogContext , SIPHandlersList
- UpdateConnectionStatus() : H323Gatekeeper
- UpdateDescriptor() : H323PeerElement
- UpdateHandlerIndexes() : SIPEndPoint
- UpdateMediaFormat() : H323Capability , OpalMediaPatch::Sink , OpalMediaPatch , OpalMediaStream
- UpdateMediaFormats() : OpalFramedTranscoder , OpalPluginFramedAudioTranscoder , OpalPluginStreamedAudioTranscoder , OpalPluginVideoTranscoder , OpalTranscoder , OpalVideoTranscoder
- updateMutex : OpalTranscoder
- UpdateOptions() : OpalPluginTranscoder
- UpdateParameters() : SIPMessageHandler , SIPRegisterHandler , SIPSubscribeHandler
- UpdateRemoteAddresses() : SIPConnection
- urj : H323GatekeeperURQ
- url : H323HTTPServiceControl
- urq : H323GatekeeperURQ
- Uruguay : OpalLineInterfaceDevice
- UsageContext : SIPURL
- usedBandwidth : H323GatekeeperServer
- useDeblocking : OpalLineMediaStream
- UseGatekeeper() : H323EndPoint
- UseGkAndEpIdentifiers() : H235Authenticator
- UseMediaPassThrough() : OpalMixerNode
- userAgentString : SIPEndPoint
- UserBusy : IAX2IeCauseCode , Q931
- userData : PluginCodec_GetCodecFunction , PluginLID_GetDefinitionsFunction , RTP_Session::Params , RTP_Session
- UserDefinedTone : OpalLineInterfaceDevice
- userIndex : IAX2EndPoint
- UserInformationMsg : Q931
- UserInput() : OpalMediaType , OpalMixerNodeManager::UserInput
- userInputAvailable : OpalConnection
- UserInputMethodUnknown : SIPConnection
- userInputString : OpalConnection
- userName : IAX2CallProcessor , IAX2Connection , IAX2IeData , IAX2RegProcessor
- username : SIPAuthInfo
- useRTPAggregation : OpalRTPConnection
- UserUserIE : Q931
- UseSession() : H323Connection , OpalRTPConnection
- UsesRTP() : OpalIMMediaType , OpalLineInterfaceDevice , OpalMediaTypeDefinition
- usPerFrame : PluginCodec_GetCodecFunction
- USSR : OpalLineInterfaceDevice
- UTF_NEWLINE : T140String
- uuiesRequested : H323Connection