### - u -

- Uganda : OpalLineInterfaceDevice
- Ukraine : OpalLineInterfaceDevice
- Unallocated : IAX2IeCauseCode
- UnallocatedNumber : Q931
- Unavailable : OpalPresenceInfo , SIPHandler
- Unchanged : OpalPresenceInfo
- 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
- Unregistered : IAX2IeCauseCode
- UnregisteredByGatekeeper : H323Gatekeeper
- UnregisteredFailureUnknown : IAX2EndPoint
- UnregisteredLocally : H323Gatekeeper
- Unsigned32 : OpalMediaOption::H245GenericInfo
- UnsignedInt : OpalMediaOption::H245GenericInfo
- Unsubscribed : SIPHandler
- Unsubscribing : SIPHandler
- Uruguay : OpalLineInterfaceDevice
- UserBusy : IAX2IeCauseCode , Q931
- UserDefinedTone : OpalLineInterfaceDevice
- userIndex : IAX2EndPoint
- UserInformationMsg : Q931
- UserInputMethodUnknown : SIPConnection
- UserUserIE : Q931
- USSR : OpalLineInterfaceDevice
- UTF_NEWLINE : T140String