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DID numbers · JP +81

Japan DID Numbers for inbound and CLI

Local numbers in Japan that ring your SIP endpoint and double as verified outbound caller IDs. Order, document and route them from the portal.

Asia Pacific+81
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key_facts · jp
country_code
+81 · JP
national_len
9–10 digits after the trunk 0
mobile
070 · 080 · 090
fixed
03 Tokyo · 06 Osaka · 052 Nagoya
regulator
Ministry of Internal Affairs and Communications (MIC)
timezone
JST (UTC+9), no daylight saving.
reviewed
2026-09-30

Overview

DID numbers to Japan

A DID (direct inward dialing) number gives you a real Japan number on your SIP trunk. It receives calls from local customers and, because you hold it, it is also the strongest caller ID you can present on outbound traffic to Japan.

Japanese 050 IP numbers and geographic numbers in major cities are available, subject to identity and address documentation required by Japanese rules. They work as inbound lines and as outbound CLIs.

Japan is a high-ARPU destination with strict consumer protection and a culture that strongly favours known numbers. International-origin calls are widely screened, so expect lower ASR than in Europe.

Number formats
TypeE.164
Fixed+81 3 1234 567803-1234-5678
Mobile+81 90 1234 5678090-1234-5678
IP / VoIP+81 50 1234 5678050-1234-5678

+81 followed by a 9–10 digit national number; the trunk 0 is dropped in E.164.

Regulation · Ministry of Internal Affairs and Communications

Caller ID rules in Japan

A practical summary for operations teams, not legal advice. Confirm current requirements with counsel before you launch.

Last reviewed

Caller-ID presentation

Japanese carriers display the presented number when it is a valid MIC-allocated Japanese number. Calls arriving from abroad are commonly flagged as international, and MIC has pressed carriers to curb international calls that falsely present Japanese numbers.

Act on Specified Commercial Transactions

Telephone solicitation must state the business name, caller name and purpose at the start of the call. Once a consumer declines, you must not call again for the same offer.

Number allocation

Number ranges are allocated by MIC. 050 numbers are IP telephony numbers and are common for business lines.

APPI

The Act on the Protection of Personal Information covers call lists and recordings, including transfers of data abroad.

Calling hours

No single statutory window. Consumer guidance discourages early-morning and late-evening sales calls.

Dialing & setup

Dialing Japan correctly

  • Drop the trunk 0: 090-1234-5678 becomes +81 90 1234 5678.
  • 0120 and 0800 freephone numbers are not reachable on international routes.
  • Golden Week (late April to early May), Obon (mid-August) and New Year (late December to early January) cut business-hours answer rates sharply.
  • Use Japanese-speaking agents and state the company name, caller name and purpose in the first sentence, as the law requires.

Caller ID best practice

Present a Japanese number you hold, typically 03 (Tokyo), 06 (Osaka) or an 050 IP number that reaches your team. Japanese carriers flag or block calls with invalid CLIs.

Troubleshooting

Common SIP errors on Japan calls

  • 404

    Not Found

    Usually the trunk 0 was kept after +81. Normalise to E.164 before dialling.

  • 480

    Temporarily Unavailable

    Handset unavailable or rejected by the subscriber’s screening service.

  • 503

    Service Unavailable

    Carrier-side congestion; retry on an alternate path.

Quality guidance

What healthy Japan traffic looks like

Japanese subscribers screen unfamiliar numbers heavily. Lower ASR here is normal; focus on ACD and complaint rates as the health signals.

25–45%

ASR

2–4min

ACD

3–7s

PDD

Typical ranges on healthy routes, as guidance only. Results depend on your lists, CLI reputation and campaign type. Live per-destination stats are in your portal.

Setup

Connect your DID number for Japan

Replace the placeholders in angle brackets with the values from your portal. Full trunk templates for each platform are in the portal after sign-up.

Asterisk inbound route+81
; extensions.conf — inbound Japan DID from CLIRoutes
[from-clirroutes]
exten => +81312345678,1,NoOp(Inbound Japan DID)
 same => n,Set(CALLERID(name)=JP support line)
 same => n,Goto(ivr-main,s,1)

; Present the same DID on outbound Japan calls once it is verified.

FAQ

Japan DID numbers: FAQ

Can’t find what you need? Our routing team answers within the hour, around the clock.

Why is ASR to Japan lower than to Europe?

Japanese subscribers screen unfamiliar numbers heavily, and many handsets warn on international-origin calls. A clean local CLI and calling during business hours help most.

Can I present an 050 number?

Yes, if it is allocated to you. 050 numbers are widely used for business IP lines in Japan and display normally on handsets.

Do I need Japanese-speaking agents?

In practice, yes. The law requires you to identify the business and the purpose at the start of the call, and English-first calls are usually ended immediately.

Which holidays affect Japanese traffic?

Golden Week, Obon and the New Year period. Many businesses close for several days, so B2B campaigns should pause or switch to callbacks.

Can I call 0120 numbers on your routes?

No. Japanese freephone numbers only accept calls from domestic networks. Ask the business for a geographic or 050 number instead.

What documents do I need for Japan DIDs?

It depends on the number type. Many geographic numbers in Japan require proof of a local address or business registration; toll-free and non-geographic numbers usually need less. The portal lists requirements per number type before you order.

Other products in Japan

Nearby countries

Related guides

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