H.239
E663660
H.239 is an ITU-T standard that enables dual video or data streams in video conferencing, allowing simultaneous transmission of live video and presentation content.
All labels observed (1)
| Label | Occurrences |
|---|---|
| H.239 canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T7428188 — 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.239 Context triple: [MCU (multipoint control unit), supports, H.239]
-
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.263
H.263 is a video compression standard developed primarily for low-bitrate communication such as video conferencing and early internet video applications.
-
C.
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.
-
D.
MCUs (multipoint control units)
MCUs (multipoint control units) are specialized devices used in video conferencing systems to connect multiple endpoints into a single conference, managing media mixing, switching, and control functions.
-
E.
G.722
G.722 is a wideband audio codec standard that provides higher-quality voice transmission than traditional narrowband codecs, commonly used in VoIP and teleconferencing applications.
- 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.239 Target entity description: H.239 is an ITU-T standard that enables dual video or data streams in video conferencing, allowing simultaneous transmission of live video and presentation content.
-
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.263
H.263 is a video compression standard developed primarily for low-bitrate communication such as video conferencing and early internet video applications.
-
C.
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.
-
D.
MCUs (multipoint control units)
MCUs (multipoint control units) are specialized devices used in video conferencing systems to connect multiple endpoints into a single conference, managing media mixing, switching, and control functions.
-
E.
G.722
G.722 is a wideband audio codec standard that provides higher-quality voice transmission than traditional narrowband codecs, commonly used in VoIP and teleconferencing applications.
- F. None of above. chosen
Statements (33)
| Predicate | Object |
|---|---|
| instanceOf |
ITU-T recommendation
ⓘ
video conferencing standard ⓘ |
| appliesTo |
multipoint video conferences
ⓘ
point-to-point video conferences ⓘ |
| category |
multimedia communication protocol
ⓘ
video coding and communication ⓘ |
| defines |
procedures for additional video channels in H.320 systems
ⓘ
procedures for additional video channels in H.323 systems ⓘ role management for multiple video streams ⓘ signaling for secondary video channels ⓘ token procedures for floor control of additional video channels ⓘ |
| enables |
dual video streams in video conferencing
ⓘ
simultaneous transmission of live video and presentation content ⓘ simultaneous video and data channels ⓘ |
| ensures | interoperability of dual-stream features between vendors ⓘ |
| publishedBy |
ITU-T
ⓘ
linked to:
ITU Telecommunication Standardization Sector
International Telecommunication Union ⓘ |
| purpose | to allow participants to see both speaker and shared content ⓘ |
| relatedTo |
H.239 dual stream
ⓘ
content channel in conferencing ⓘ |
| roleInSystem |
coordination of which endpoint sends presentation content
ⓘ
negotiation of additional video channels ⓘ |
| sector | ITU Telecommunication Standardization Sector ⓘ |
| standardNumber | H.239 ⓘ |
| standardType | communication protocol specification ⓘ |
| supports |
content channel separate from main video channel
ⓘ
data collaboration alongside video ⓘ presentation sharing in video conferences ⓘ |
| usedIn |
telepresence systems
ⓘ
video conferencing systems ⓘ |
| usedWith |
H.245
ⓘ
H.320 ⓘ H.323 ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: H.239 Description of subject: H.239 is an ITU-T standard that enables dual video or data streams in video conferencing, allowing simultaneous transmission of live video and presentation content.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject linked to:
MCUs (multipoint control units)