Signaling System No. 7

E409009

ITU-T standard signaling system telecommunications signaling protocol suite

Signaling System No. 7 is a global telecommunications signaling protocol suite used to set up and manage telephone calls and other services across digital networks.

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

All labels observed (5)

Label	Occurrences
Signaling System No. 7 canonical	4
Signaling Connection Control Part	2
Common Channel Signaling System No. 7	1
ITU-T signaling system No.7	1
SS7	1

How this entity was disambiguated

This entity first appeared as the object of triple T4031820 — 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: Signaling System No. 7
Context triple: [5ESS switch, supportsSignaling, Signaling System No. 7]

A. SONET
SONET (Synchronous Optical Network) is a standardized digital communication protocol used to transmit large volumes of data over optical fiber in high-speed telecommunications networks.
B. Standard Telecommunication Laboratories
Standard Telecommunication Laboratories was a British research facility renowned for its pioneering work in fiber-optic communications, notably associated with the groundbreaking research of Charles K. Kao.
C. X.25
X.25 is an early ITU-T packet-switched network protocol standard widely used for WAN communication before the rise of modern IP-based networks.
D. GSM-R
GSM-R is a digital radio communication system used across European railways to provide secure voice and data links between trains and railway control centers.
E. POTS (Plain Old Telephone Service)
POTS (Plain Old Telephone Service) is the traditional analog voice telephone service that formed the basis of the public switched telephone network for most of the 20th century.
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: Signaling System No. 7
Target entity description: Signaling System No. 7 is a global telecommunications signaling protocol suite used to set up and manage telephone calls and other services across digital networks.

A. SONET
SONET (Synchronous Optical Network) is a standardized digital communication protocol used to transmit large volumes of data over optical fiber in high-speed telecommunications networks.
B. Standard Telecommunication Laboratories
Standard Telecommunication Laboratories was a British research facility renowned for its pioneering work in fiber-optic communications, notably associated with the groundbreaking research of Charles K. Kao.
C. X.25
X.25 is an early ITU-T packet-switched network protocol standard widely used for WAN communication before the rise of modern IP-based networks.
D. GSM-R
GSM-R is a digital radio communication system used across European railways to provide secure voice and data links between trains and railway control centers.
E. POTS (Plain Old Telephone Service)
POTS (Plain Old Telephone Service) is the traditional analog voice telephone service that formed the basis of the public switched telephone network for most of the 20th century.
F. None of above. chosen

Statements (57)

Predicate	Object
instanceOf	ITU-T standard ⓘ signaling system ⓘ telecommunications signaling protocol suite ⓘ
alsoKnownAs	C7 ⓘ CCSS7 ⓘ Common Channel Signaling System No. 7 ⓘ linked to: Signaling System No. 7 SS7 ⓘ
basedOn	common channel signaling ⓘ
developedBy	International Telecommunication Union ⓘ
globallyDeployed	true ⓘ
governingBody	ITU-T Study Group 11 ⓘ
hasComponent	ISDN User Part ⓘ linked to: ISDN ISUP ⓘ MAP ⓘ MTP Level 1 ⓘ MTP Level 2 ⓘ MTP Level 3 ⓘ Message Transfer Part ⓘ Mobile Application Part ⓘ OMAP ⓘ Operations, Maintenance and Administration Part ⓘ SCCP ⓘ Signaling Connection Control Part ⓘ linked to: Signaling System No. 7 TCAP ⓘ TUP ⓘ Telephone User Part ⓘ Transaction Capabilities Application Part ⓘ
introducedInDecade	1970s ⓘ
layerModel	four-layer model ⓘ
operatesOn	separate signaling channels ⓘ
partOf	mobile telecommunications networks ⓘ public switched telephone network ⓘ linked to: Public Switched Telephone Network
relatedStandard	SIGTRAN ⓘ
replaced	Signaling System No. 6 ⓘ
securityIssues	SMS interception vulnerabilities ⓘ call interception vulnerabilities ⓘ location tracking vulnerabilities ⓘ
standardizedBy	ITU-T ⓘ linked to: ITU Telecommunication Standardization Sector
supports	SMS interworking ⓘ circuit-switched telephony ⓘ intelligent network queries ⓘ mobile telephony ⓘ
transportedOver	IP networks via SIGTRAN ⓘ TDM networks ⓘ
usedFor	call routing ⓘ call setup ⓘ call teardown ⓘ intelligent network services ⓘ local number portability ⓘ number translation ⓘ out-of-band signaling ⓘ prepaid billing ⓘ roaming in mobile networks ⓘ short message service ⓘ supplementary services ⓘ
usesAddressingScheme	point codes ⓘ subsystem numbers ⓘ

How these facts were elicited

Referenced by (9)

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

5ESS switch → supportsSignaling → Signaling System No. 7 ⓘ

Public Switched Telephone Network → usesSignalingSystem → Signaling System No. 7 ⓘ

SS7 → fullName → Signaling System No. 7 ⓘ

SS7 → abbreviationFor → Signaling System No. 7 ⓘ

SS7 → includesComponent → Signaling Connection Control Part ⓘ