References to ITU‑T P.1140 in the automotive industry are increasing, but many engineers confuse its application scenarios. Core boundary: P.1140 is for vehicle emergency‑call systems – eCall, ERA‑GLONASS emergency voice scenarios – not for everyday Bluetooth hands‑free. Standard car HFP hands‑free uses P.1100 (narrowband) and P.1110 (wideband) – these are independent from P.1140. Scenario confusion is widespread.

1. P.1140 Scope – Clear Definition

1.1 Applicable scenarios
ITU‑T P.1140 covers a full voice‑quality assessment suite for narrowband and wideband hands‑free communication – the design scenario is emergency calls. After a vehicle collision, eCall is automatically triggered – connecting to the emergency dispatch centre. This environment differs significantly from everyday driving hands‑free. eCall scenarios are primarily single‑person emergency communication – no multi‑person alternating conversation – noise environment, speaker position, and communication priority all have specific settings.

1.2 Important correction
ITU‑T Recommendations do not establish an independent certification system. The industry term "P.1140 certification" is a colloquialism – the formal description is voice performance testing against ITU‑T P.1140. There is no standalone P.1140 certificate – institutions can only issue test reports.

  2. P.1140 and P.863 (POLQA) – The Relationship

This is a common trap:

·P.1140 is a test method specification – defines test environment, conditions, performance metrics, and judgement criteria.

·P.863 (POLQA) is a voice‑quality objective assessment algorithm – used to calculate MOS scores.

Correct execution logic: within the P.1140 test framework, use POLQA for voice quantification – no need for two separate tests. Many companies are misled into thinking these are independent test items – wasting resources.

MOS score is only one reference indicator – cannot be used alone as a pass/fail basis. Loudness, echo loss, duplex performance, idle‑channel noise, and transmit/receive frequency response – dozens of objective indicators must all meet standards. Projects often pass MOS but fail other acoustic items.

  3. 2026 Standard Revision Progress

In the first half of 2026, ITU‑T SG12 continued to maintain P.1140 – revisions focus on evaluation methods for AI noise‑reduction algorithms in emergency‑call scenarios.

·Traditional DSP noise reduction and AI noise reduction have different voice‑segment suppression characteristics in high‑noise environments – existing criteria need optimisation.

·The standard also clarifies that its native scenario is single‑person emergency calls. Multi‑person alternating speech and overlapping conversation are not covered by P.1140 – cabin everyday multi‑person calls still follow P.1110.

The revision draft has not yet been formally published – final clauses and effective dates are subject to ITU official announcements.

  4. Test Environment Setup – Practical Points

4.1 Test‑vehicle priority

·Whole‑vehicle cabin testing – highest priority.

·Anechoic chambers – only for component‑level pre‑testing.

For eCall type‑approval review, whole‑vehicle cabin data is the preferred official recognition. Many manufacturers only test in anechoic chambers – reports cannot be used for R144 review submission.

4.2 Noise conditions and equipment calibration

·The HATS (Head and Torso Simulator) must be positioned exactly at the driver's head position.

·Noise playback cannot use ordinary road recordings – the test noise library must cover urban roads, highways, tunnels, and rain scenarios – loudspeaker array frequency response and directivity must be calibrated before testing.

·For T‑Box module testing alone – standard simulation cavities are sufficient – not affected by cabin size.

·Sedan vs. SUV reverberation differences only affect whole‑vehicle testing.

  5. Differentiation from Other In‑Vehicle Voice Test Systems

P.1140 reports cannot be used for CarPlay CPTF or Huawei HiCar call testing.

·Apple CarPlay hands‑free acoustic testing mandates P.1100 and P.1110.

·Huawei HiCar call testing also aligns with P.1110.

Neither ecosystem accepts P.1140 reports. Only T‑Boxes and head units with eCall emergency‑call functionality require P.1140 reports. Head units without eCall – supporting only ordinary Bluetooth calls – generally require P.1110 – no P.1140 testing.

HEAD acoustics ACQUA is the industry's mainstream test platform – but it is only a test tool – not a standard itself.

  6. Lab Selection and Project Scheduling

·Domestic labs with full P.1140 capability are limited – mainly specialised communication‑acoustic institutions.

·Overseas testing resources are concentrated in Europe and Japan.

Lab selection – cannot compare only price – verify that the lab has experience with vehicle‑type sound‑field calibration.

If the new standard version is officially released in the second half of 2026, confirm with the lab when the new test suite will be ready. During standard transitions, lab scheduling is tight – delayed communication can create project gaps of 2–3 months.

For ITU‑T P.1140 voice testing 2026, contact BlueAsia at 13534225140 (King) or king.guo@cblueasia.com.