In‑vehicle T‑Boxes connect vehicles to the outside world – emergency calling, remote control, OTA upgrades – all depend on it. With so many functions, certification becomes complex. Exporting T‑Boxes involves European regulations, international standards, and automotive industry specifications – most failures come from misidentifying the device's status and scope boundaries.

1. Why Is T‑Box Certification So Complex?

1.1 Function determines scope – identity first

T‑Boxes integrate cellular communication, positioning, and voice processing – each with its own regulations – certification must address each separately. Identity is critical:

·Front‑load OEM‑fitted, not sold separately – generally not treated as independent radio equipment – cybersecurity is covered by the vehicle's UN R155 system.

·Sold as a standalone retail product or aftermarket – subject to independent radio equipment compliance.

Without determining identity first, standards are meaningless.

1.2 Target market determines the combination

·EU: eCall regulations.

·China: domestic standards.

·North America: FCC and operator carrier approvals.

Once the market is defined, the combination can be planned.

  2. eCall – The Path

2.1 Regulatory hierarchy and UN R144

The EU eCall regulatory base is (EU) 2015/758 – (EU) 2024/1180 is a revision – the parent regulation remains the same. Technical execution follows UN R144 under UN WP.29. T‑Boxes can obtain standalone R144 component approval – then the whole vehicle does WVTA. Obtaining the component certificate does not mean the whole vehicle automatically meets eCall – the OEM must still integrate and verify the full system in the WVTA application – wiring, microphone, antenna, and interaction logic are all in scope. Component certification and whole‑vehicle certification are two separate tracks – often confused.

2.2 Standard versions and timelines

·From 1 January 2026, new applications use NG eCall – test specifications: CEN/TS 17184:2022 and CEN/TS 17240:2018 (these are technical specifications – not formal standards).

·From 1 January 2027, new type approvals must use formal standards EN 17184:2024 and EN 17240:2024.

·Early certificates issued under CEN/TS – around 2028, many certification bodies plan to tighten version requirements – applicability is uncertain – for new projects, plan tests directly against EN versions.

2.3 Core test items

·Backup power: 5‑minute call + 56‑minute standby + 5‑minute call – total 66 minutes (not 66 minutes of continuous calling).

·IMS call‑setup latency: 3 seconds for already‑camped standby scenarios – cold start/no‑network scenarios follow the standard's relaxed provisions – thresholds vary between labs – confirm before starting.

·MSD: from 1 January 2027, new type approvals mandate V3. Previously approved certificates remain valid – using V2.

2.4 Dual‑mode fallback and hardware selection

NG eCall requires both IMS and CS channels:

·4G/5G IMS is the primary channel.

·When the PSAP doesn't support IMS or coverage is lost – fallback to 2G/3G circuit‑switched.

·Pure 4G single‑mode cannot pass certification – legacy CS‑only hardware also fails – new projects should design for dual‑mode architecture.

2.5 Domestic AECS

China's counterpart is GB 45672-2025 – in‑vehicle emergency call system (AECS) – mandatory from 1 July 2027. Both EU eCall and AECS use IMS architecture – but the standard systems differ – interoperability is limited – cannot be directly equated.

  3. ITU‑T Voice Quality

P.1140 positioning and testing

P.1140 is an ITU‑T Recommendation covering in‑vehicle hands‑free voice quality – testing call‑setup latency, voice clarity, and echo suppression – scored under simulated noise conditions.

Recommendations have no mandatory market‑access effect – the EU eCall regulation does not list it as mandatory – whether it's accepted or supplementary testing is required – depends on the Technical Service.

  4. Cybersecurity

4.1 R155 and 21434 – the relationship

The obligation under R155 rests on the OEM – assessed during whole‑vehicle WVTA – the regulation does not require component‑level certificates. Tier‑1s follow ISO/SAE 21434 for development processes – delivering security evidence packages to support the vehicle‑level assessment – this is a common approach, but the regulation does not mandate 21434 specifically.

4.2 EN 18031 – boundary

EN 18031 is a harmonised standard under RED – mandatory from 1 August 2025 – applying to standalone radio equipment. Front‑load OEM‑fitted T‑Boxes (not sold separately) are covered by vehicle R155 – generally do not need separate RED cybersecurity assessment. Standalone retail or aftermarket units – must comply. For commercial vehicles or retrofit T‑Boxes purchased separately – even if nominally front‑load, they may still be treated as standalone – assess based on sales model, supply contracts, and member‑state enforcement.

4.3 RF compliance – module certificate ≠ whole‑product compliance

Cellular modules themselves require RED, FCC, and other RF certifications – these are pre‑requisites – certificates are generally provided by the module manufacturer. The module certificate does not substitute for whole‑product RF compliance – the T‑Box still needs radiated emissions, antenna integration, and whole‑product RF testing. Plan module and whole‑product testing separately from the start.

  5. Software Updates

R156 and change management

UN R156 governs software updates – requires a SUMS (Software Upgrade Management System) – the obligation rests on the OEM – suppliers provide supporting assessments. China's counterpart is GB 44496-2024.

Changes are classified:

·Minor software changes: fast‑track assessment.

·Major changes (hardware, RF modules): trigger retesting.

Not every firmware upgrade requires full retesting – confirm with the certification body before release.

  6. Positioning and EMC

6.1 GNSS positioning compliance

T‑Boxes with GNSS – for EU and North America, receiver RF and positioning performance have test requirements – antenna placement, interference suppression, and weak‑signal sensitivity must all be verified. Positioning is often overlooked – include it in the plan from the start.

6.2 In‑vehicle EMC

·CISPR 25 is the international baseline – in Europe, applied as EN IEC 55025 – reports should be issued against the target‑market version.

·UN R10 electromagnetic compatibility is mandatory for whole vehicles – but components obtaining separate R10 E‑mark is not an EU regulatory requirement – some European OEMs require it in procurement specifications.

·OEM internal specifications add stricter limits – submitting old‑version CISPR 25 reports will be challenged.

·Power transients: ISO 7637 series.

·Environmental: temperature cycling, vibration, salt spray – per OEM specifications.

  7. How to Execute Certification

Assessment, testing, and documentation

Start with the hardware configuration and functional list – determine the market and front‑load/aftermarket identity – then list the regulatory combination and test items. Run tests in parallel where possible – prepare multiple samples – confirm report validity for reuse. Technical documents, circuit diagrams, software version descriptions, and security analysis reports – completeness directly affects the timeline.

  8. Timeline and Costs

A typical project: 3–6 months – actual timeline depends on sample remediation, lab scheduling, change reviews, and system‑documentation readiness. Major costs: test fees – followed by system audits – lab quotes vary significantly.

Passing eCall does not mean the whole product is compliant – remote wake‑up, OTA, and positioning each have their own requirements – when assessing, go through the functional list item by item. European requirements cannot be directly applied to domestic projects – standards differ – reference is fine – copying is not.

T‑Box certification ultimately comes down to two things: identity and boundaries. Clarify identity, layer, version, and mandatory/voluntary status – then the rest is procedural.

BlueAsia can provide product assessment, test co‑ordination, documentation support, and change management – from eCall to ITU‑T – helping your export certification journey run smoothly.

For T‑BOX certification, contact BlueAsia at 13534225140 (King) or email king.guo@cblueasia.com.