Asia
SIP Trunk Japan — +81 Termination & DID Numbers
Japanese customers tend to trust a local 03 Tokyo or 06 Osaka number far more than an unfamiliar international one. Japan also has 050 IP-phone numbers and two toll-free ranges, 0120 and 0800. Identity checks for numbers are strict, so plan time for paperwork.
Overview
Routing calls to Japan
Whether you are calling a desk phone in Tokyo or a mobile in Yokohama, Nagoya, Fukuoka and Sapporo, the call is routed by the longest matching +81 prefix and sent to the best-performing carrier for that range. When a carrier fails, the next one takes over, and the CDR shows exactly which leg carried the call.
Numbering in Japan is managed by MIC. We terminate to geographic, national, mobile and toll-free ranges and price each one separately on the rate sheet. Inside the country, numbers are dialled with a 0 trunk prefix. Strip it before you send the call, and send 81 followed by the national number.
For inbound numbers in Japan, plan on paperwork: proof of address and company or identity documents are usually required before a DID goes live. Termination needs no documents beyond normal account checks.
What you get
What you get in Japan
One account and one balance, with the same SBCs for termination and inbound numbers.
CLI route tier
Caller ID delivered end to end on +81 calls. Use it for sales, support and any traffic where answer rates matter.Non-CLI route tier
A lower-cost tier where caller ID delivery is not guaranteed. Suitable for internal or transactional traffic that does not depend on the CLI.Number types
Geographic, National, Mobile, Toll-free. DID availability varies by range and city.Codecs
G.711a/u and G.729 on every route, G.722 and Opus where the far end supports them. T.38 for fax.Channels on demand
Concurrent call limits are set per account and raised as your traffic grows. No fixed channel bundles.Multi-carrier failover
Every +81 prefix is mapped to more than one carrier. Failed attempts move to the next one automatically.
Number formats
How to dial Japan from your PBX
Send E.164 digits. The sample number below shows the format only.
| Format | Example | Notes |
|---|---|---|
| International (E.164) | +81 3 1234 5678 | How the number is written and stored. |
| Sent from your PBX | 81312345678 | E.164 digits with no plus, prefixed by your tech prefix if your account uses one. |
| With 00 exit code | 00 81 3 1234 5678 | Accepted on the trunk. We normalise it to E.164. |
| National format | 03 1234 5678 | Dialled inside Japan. Strip the trunk prefix before sending. |
Compliance
Japan rules to know
What applies before your first call or your first DID goes live.
Compliance box
- Regulator
- MIC
- Caller ID
- A valid CLI that you are entitled to use is required on CLI routes. Spoofed or unallocated numbers are blocked.
- DID KYC
- Usually required
Rules change — our team confirms current requirements before activation.
Use cases
Who uses Japan routes
- 01
Japanese-language customer service with Tokyo 03 and Osaka 06 numbers
- 02
Foreign companies entering Japan using 050 IP numbers
- 03
0120 toll-free lines for retail and consumer electronics
Setup
Start calling Japan in 3 steps
- 01
Top up $200
Open a prepaid account and add balance by USDT (TRC20), BTC or card. - 02
Add your trunk
Whitelist your PBX IP or create digest credentials, then point your outbound route at our SBC. - 03
Dial +81
Send 81 + national number in E.164 and check the CDR for your first test call.
Further reading: Buying DID Numbers Abroad: KYC, Formats and Costs
FAQ
Japan SIP trunk questions
What are 050 numbers?
Non-geographic IP-phone numbers, widely used for VoIP services.
Which toll-free ranges exist?
0120, the traditional range, and 0800.
Who regulates Japanese telecoms?
The MIC (Ministry of Internal Affairs and Communications).
Do Japanese DIDs need documents?
Usually yes: a Japanese address and identity or company documents.
