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ITU-T Recommendations
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ITU-T Recommendations
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ITU-T Recommendations by series
Select a series of Recommendations
A series: Organization of the work of ITU-T
D series: Tariff and accounting principles and international telecommunication/ICT economic and policy issues
E series: Overall network operation, telephone service, service operation and human factors
F series: Non-telephone telecommunication services
G series: Transmission systems and media, digital systems and networks
H series: Audiovisual and multimedia systems
I series: Integrated services digital network
J series: Cable networks and transmission of television, sound programme and other multimedia signals
K series: Protection against interference
L series: Environment and ICTs, climate change, e-waste, energy efficiency; construction, installation and protection of cables and other elements of outside plant
M series: Telecommunication management, including TMN and network maintenance
N series: Maintenance: international sound programme and television-transmission circuits
O series: Specifications of measuring equipment
P series: Telephone transmission quality, telephone installations, local line networks
Q series: Switching and signalling, and associated measurements and tests
R series: Telegraph transmission
S series: Telegraph services terminal equipment
T series: Terminals for telematic services
U series: Telegraph switching
V series: Data communication over the telephone network
X series: Data networks, open system communications and security
Y series: Global information infrastructure, Internet protocol aspects, next-generation networks, Internet of Things and smart cities
Z series: Languages and general software aspects for telecommunication systems
Q series
: Switching and signalling, and associated measurements and tests
Q.1-Q.3
: Signalling in the international manual service
Q.4-Q.59
: International automatic and semi-automatic working
Q.60-Q.99
: Functions and information flows for services in the ISDN
Q.100-Q.119
: Clauses applicable to ITU-T standard systems
Q.120-Q.499
: Specifications of Signalling Systems No. 4, 5, 6, R1 and R2
Q.500-Q.599
: Digital exchanges
Q.600-Q.699
: Interworking of Signalling Systems
Q.700-Q.799
: Specifications of Signalling System No. 7
Q.800-Q.849
: Q3 interface
Q.850-Q.999
: Digital subscriber Signalling System No. 1
Q.1000-Q.1099
: Public land mobile network
Q.1100-Q.1199
: Interworking with satellite mobile systems
Q.1200-Q.1699
: Intelligent Network
Q.1700-Q.1799
: Signalling requirements and protocols for IMT-2000
Q.1900-Q.1999
: Specifications of signalling related to Bearer Independent Call Control (BICC)
Q.2000-Q.2999
: Broadband ISDN
Q.3000-Q.3709
: Signalling requirements and protocols for the NGN
Q.3710-Q.3899
: Signalling requirements and protocols for SDN
Q.3900-Q.4099
: Testing specifications
Q.4100-Q.4139
: Protocols and signalling for peer-to-peer communications
Q.4140-Q.4159
: Protocols and signalling for computing power networks
Q.4160-Q.4179
: Protocols and signalling for Quantum key distribution networks
Q.5000-Q.5049
: Signalling requirements and protocols for IMT-2020
Q.5050-Q.5069
: Combating counterfeiting and stolen ICT devices
Q supplements
: Supplements to ITU-T Q-series Recommendations
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