O	Offset
O	OldStateValue
O	Optional
O	oculomotor
O	optional
O&M	Operations &Maintenance
OA	Outgoing Access
OACSU	Off-air-call-set-up
OBA	object-based audio
OBUE	Operating Bands Unwanted emissions
OBUE	operating band unwanted emission
OBUE	operating band unwanted emissions
OCB	Outgoing Call Barring
OCB	Outgoing Communication Barring
OCB	Outgoing Communications Barring
OCB	occupied channel bandwidth
OCF	Online Charging Function
OCI	Originating Carrier Identification
OCNG	OFDMA Channel Noise Generator
OCS	Online Charging System
OCS	Online Charging Systems
OCS	Originating Call Screening
OCSP	online certificate status protocol
ODB	Operator Determined Barring
ODR	Origin dependent routing
OETF	opto-electronic transfer function
OFDM	orthogonal frequency division multiplexing
OFO	Observed Frequency Offset
OIP	Originating Identification Presentation
OIP	Originating Identity Presentation
OIP	Originating identification presentation
OIR	Originating Identification Restriction
OIR	Originating Identity Restriction
OIR	Originating identification restriction
OL	Open-Loop
OLCM	Outgoing Leg Control Model
OLLA	Outer Loop Link Adaptation
OLPC	Outer Loop Power Control
OM	Object Mapping
OMA	Open Mobile Alliance
OMG	Object Management Group
OMG	Object Management Group's
OMR	Optimal Media Routeing
OMR	Optimal Media Routing
OMT	Other Modem Type
ON	Onboarding Network
ONC	Off-net calling
OOB	Out of Band
OOBE	Out of Band Emission
OOBE	Out-Of-Band-Emissions
OOBE	out of band emission
OOC	out of coverage
OP	OpenID Provider
OPERA	Open PLC European Research Alliance
OPI	Offload Preference Indicator
OPM	Offload Processing Module
ORB	Object Request Broker
OS	Open Service
OS	Operating System
OS	Operations System
OS	Operations Systems
OSA	Open Service Access
OSA	Open Services Access
OSF	Operations System Functions
OSHO	Old Selected home Operator
OSP	Octet Stream Protocol
OSS	Operation Support System
OSS	Operations Support System
OSS	Operator Specific Service
OSTP	OFDM Symbol TX power
OTA	Over The Air
OTA	Over-the-air
OTDOA	Observed Time Difference Of Arrival
OUI	Organizationally Unique Identifier
OUP	Originating user prompter
OVD	Optimum Viewing Distance