H.245

E663662

ITU-T Recommendation control protocol multimedia communication protocol

H.245 is an ITU-T control protocol used in multimedia communication systems to negotiate channel usage and capabilities between endpoints.

Try in SPARQL Jump to: Surface forms Disambiguation Statements Elicitation Referenced by

All labels observed (2)

Label	Occurrences
H.245 canonical	3
H.245 control protocol	2

How this entity was disambiguated

This entity first appeared as the object of triple T7428284 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: H.245
Context triple: [H.323, includes, H.245]

A. H.323
H.323 is an ITU-T standard that defines protocols for voice, video, and data communication over packet-based networks such as IP.
B. H.248
H.248 is an ITU-T protocol, also known as Megaco, used for controlling media gateways in next-generation and IP multimedia networks.
C. H.263
H.263 is a video compression standard developed primarily for low-bitrate communication such as video conferencing and early internet video applications.
D. RFC 5245
RFC 5245 is the IETF specification that standardizes Interactive Connectivity Establishment (ICE), a framework for NAT traversal used to establish media and data connections in real-time communication protocols like SIP and WebRTC.
E. Session Description Protocol
Session Description Protocol (SDP) is a format used in multimedia communication systems to describe streaming media sessions for purposes such as session announcement, invitation, and negotiation of media parameters.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: H.245
Target entity description: H.245 is an ITU-T control protocol used in multimedia communication systems to negotiate channel usage and capabilities between endpoints.

A. H.323
H.323 is an ITU-T standard that defines protocols for voice, video, and data communication over packet-based networks such as IP.
B. H.248
H.248 is an ITU-T protocol, also known as Megaco, used for controlling media gateways in next-generation and IP multimedia networks.
C. H.263
H.263 is a video compression standard developed primarily for low-bitrate communication such as video conferencing and early internet video applications.
D. RFC 5245
RFC 5245 is the IETF specification that standardizes Interactive Connectivity Establishment (ICE), a framework for NAT traversal used to establish media and data connections in real-time communication protocols like SIP and WebRTC.
E. Session Description Protocol
Session Description Protocol (SDP) is a format used in multimedia communication systems to describe streaming media sessions for purposes such as session announcement, invitation, and negotiation of media parameters.
F. None of above. chosen

Statements (46)

Predicate	Object
instanceOf	ITU-T Recommendation ⓘ control protocol ⓘ multimedia communication protocol ⓘ
belongsToSeries	H-series ⓘ linked to: Series H
category	real-time communication protocol ⓘ
defines	capability exchange procedures ⓘ conference control procedures ⓘ control channel procedures ⓘ flow control procedures ⓘ logical channel signaling ⓘ master-slave determination procedures ⓘ round-trip delay determination procedures ⓘ
enables	bandwidth management via flow control ⓘ dynamic capability negotiation ⓘ interoperability between different terminals ⓘ
layer	control layer above transport ⓘ
operatesBetween	communication endpoints ⓘ
organization	International Telecommunication Union ⓘ
purpose	negotiate capabilities between endpoints ⓘ negotiate channel usage between endpoints ⓘ
relatedTo	H.225.0 ⓘ H.320 ⓘ H.323 ⓘ H.324 ⓘ
roleInH.323	control signaling between endpoints ⓘ
scope	call control and capability negotiation ⓘ
sector	ITU Telecommunication Standardization Sector ⓘ
specifies	message formats for control signaling ⓘ state machines for control procedures ⓘ
standardizedBy	ITU-T ⓘ linked to: ITU Telecommunication Standardization Sector
status	international standard ⓘ
supports	audio capabilities negotiation ⓘ data capabilities negotiation ⓘ logical channel closure ⓘ logical channel establishment ⓘ logical channel modification ⓘ video capabilities negotiation ⓘ
transportedOver	TCP in H.323 ⓘ
usedIn	H.320 systems ⓘ H.323 systems ⓘ H.324 systems ⓘ linked to: H.324 multimedia over circuit-switched networks multimedia communication systems ⓘ videoconferencing systems ⓘ voice over IP systems ⓘ
usesEncoding	ASN.1 ⓘ PER ⓘ

How these facts were elicited

Referenced by (5)

Full triples — surface form annotated when it differs from this entity's canonical label.

H.323 → includes → H.245 ⓘ

H.263 → usedWith → H.245 control protocol ⓘ

linked to: H.245

H.450 supplementary services → usesSignallingProtocol → H.245 ⓘ

H.450 supplementary services → relatedStandard → H.245 ⓘ

H.324 → uses → H.245 control protocol ⓘ

subject linked to: H.324 multimedia over circuit-switched networks