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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
P series
: Telephone transmission quality, telephone installations, local line networks
P.10-P.19
: Vocabulary and effects of transmission parameters on customer opinion of transmission quality
P.30-P.39
: Voice terminal characteristics
P.40-P.49
: Reference systems
P.50-P.59
: Objective measuring apparatus
P.60-P.69
: Objective electro-acoustical measurements
P.70-P.79
: Measurements related to speech loudness
P.80-P.89
: Methods for objective and subjective assessment of speech quality
P.300-P.399
: Voice terminal characteristics
P.500-P.599
: Objective measuring apparatus
P.700-P.709
: Measurements related to speech loudness
P.800-P.899
: Methods for objective and subjective assessment of speech and video quality
P.900-P.999
: Audiovisual quality in multimedia services
P.1000-P.1099
: Transmission performance and QoS aspects of IP end-points
P.1100-P.1199
: Communications involving vehicles
P.1200-P.1299
: Models and tools for quality assessment of streamed media
P.1300-P.1399
: Telemeeting assessment
P.1400-P.1499
: Statistical analysis, evaluation and reporting guidelines of quality measurements
P.1500-P.1599
: Methods for objective and subjective assessment of quality of services other than speech and video
P supplements
: Supplements to ITU-T P-series Recommendations
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