The telecommunication standardisation arm of the International Telecommunication Union publishes Recommendations, which are technical specifications. They do not, by themselves, create any mandatory market access requirement in any country or region. Trade shorthand talks about "P.1140 certification", but the accurate description is performance testing carried out against that recommendation, and what a laboratory can issue is a test report. There is no certificate named after a recommendation number.
Getting this straight first is what stops the wrong standard being chosen later. Whether a product can enter a given market depends on local regulation and approval lists. A recommendation governs how a technical parameter is defined and how it is measured.
K.116 covers electromagnetic compatibility of radio telecommunication terminal equipment. Its scope opens by describing radio telecommunication terminal equipment and associated accessories, then lists three categories by way of example: cellular mobile and portable radio equipment, including 5G; devices developed under the Bluetooth standards; and Wi-Fi equipment. The test conditions set out configurations, limits and performance criteria for emissions and immunity, and the annexes cover test modes for 5G and for smartphones. The recommendation itself states that where an ITU-R provision exists it takes precedence over this recommendation. That is a constraint it places on itself, not a general rule governing the two sectors.
K.20 and K.21 deal with the ability of communication equipment to withstand overvoltage and overcurrent, one aimed at exchange premises and the other at customer premises. K.21 applies to subscriber-side communication equipment connected to telecom lines, not to every electronic product sitting at a customer site. Gateways, optical network units and switches connected to an operator network commonly fall under it.
P.1140 covers the voice communication requirements for vehicle-initiated emergency calls, across narrowband and wideband. According to ITU's own pages the current version is the fourth edition, approved in July 2026, sitting in the P.1100 to P.1199 range covering communications involving vehicles. Day-to-day hands-free operation uses P.1100 and P.1110, one narrowband and one wideband, which sit alongside P.1140 rather than replacing it. P.863 is an objective algorithm for assessing speech quality to produce a MOS score; it is not a standalone test item and is simply called within the P.1140 framework. Whether it is used, and which version, depends on the access requirements for the project in hand, and it is not mandatory in every scenario.
In optical access, the G.984 series covers gigabit passive optical networks, G.9807.1 covers 10-gigabit symmetric passive optical networks with G.9807 as the series umbrella, and G.988 covers the management and control interface for optical network units. In optical transport, G.709 is the core recommendation for optical transport networks, while G.652 and G.657 cover the characteristics of single-mode and bend-insensitive fibre. The speech coding recommendations G.711, G.722 and G.729 are widely used in gateways and terminals.
H.264, H.265 and H.266 are video coding recommendations, followed by set-top boxes, video conferencing terminals and live encoding equipment; all three were developed jointly by ITU-T and ISO/IEC. The Y series covers network architecture and capability requirements for the internet of things and connected vehicles. The mainline of the X series is data networks, open systems communications and information infrastructure security. Security is only one part of it - specifications for inter-network interworking and network architecture are also concentrated there.
It comes from adoption, not from ITU-T itself. Two routes are common. A country or region transposes a recommendation into a local standard, as happens with the adopted versions inside China's communications industry standards. Alternatively, a regional regulation writes a parameter into its access requirements, or lists the corresponding standard as a harmonised standard.
So the same product may be cited differently in different markets. The work at project kick-off is not "which recommendation governs me" but "which recommendation has this market turned into something that must be satisfied". That is the framing BlueAsia uses when scoping a file.
P.1140 is not an ultra-wideband standard. It covers narrowband and wideband voice in an emergency call scenario, and ultra-wideband in-vehicle hands-free is a different number entirely. Mix up the standard number and the whole test plan leans the wrong way.
A P.1140 report cannot be used to cover ordinary hands-free testing, because the two do not measure the same thing. P.1140 addresses vehicle-initiated emergency calls, while for everyday hands-free calls the sector picks P.1100 and P.1110. It is not a case of one system refusing to accept a report; the scenario and the parameters simply do not line up. Where a head unit only handles ordinary Bluetooth calls, the first question when scheduling these projects is whether emergency call capability is in scope.
Test sites and simulation methods follow whatever the applicable regulation and standard require. Measuring inside a vehicle cabin is one approach, and an anechoic chamber fitted with a head-and-torso simulator is equally accepted. It is not accurate to say an anechoic chamber is only good for pre-testing.
Contact: King Email: king.guo@cblueasia.comAddress: Building C, Hongjingda Industrial Park, No. 107 Beihuan Road, Shiyan Street, Bao'an District, Shenzhen, China BlueAsia delivers more than service!
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