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Country Summary

Country nameJapan
ISO codeJP
RegionAsia
Dialing code+81

Reachability

Inbound
Ability to call numbers in Japan
Outbound
Ability to call non-Twilio numbers in Japan
DomesticYesYes
InternationalYesYes
Toll-FreeYesYes
Outbound restrictions

Caller ID cannot be preserved for domestic calls from registered/verified caller ID.

Premium-rate telephone numbers are blocked and can’t be called. These are: +81170, +81180, +81570, +81910, +81990, +8101, and +8105.

Anonymous calling is not supported by default. Some underlying hosting number providers to not support anonymous calling for their number types.

Outbound requirements

N/A

Best practices

When calling Twilio phone numbers from a Japanese domestic line, the Japanese phone number must be prefixed with zero. In this number format, known as the national format, it is not necessary to include the Japan country code.

Caller ID

Inbound
Inbound call receives originator's Caller-ID
Outbound
Outbound call preserves sent Caller-ID
Domestic+E.164Local
InternationalE.164 (Non-guaranteed)+E.164
Toll-Free+E.164Local

DTMF

Inbound
Inbound call receives DTMF from PSTN
Outbound
Outbound call sends DTMF to PSTN
RFC.2833 formatYesYes

Emergency Calling

Outbound
Ability to make Emergency Calls
Emergency servicesNo

Reachability

Outbound
Ability to call non-Twilio numbers in Japan
Inbound
Ability to call numbers in Japan
DomesticYes
InternationalYes
Toll-FreeYes
DomesticYes
InternationalYes
Toll-FreeYes
Outbound restrictions

Caller ID cannot be preserved for domestic calls from registered/verified caller ID.

Premium-rate telephone numbers are blocked and can’t be called. These are: +81170, +81180, +81570, +81910, +81990, +8101, and +8105.

Anonymous calling is not supported by default. Some underlying hosting number providers to not support anonymous calling for their number types.

Outbound requirements

N/A

Best practices

When calling Twilio phone numbers from a Japanese domestic line, the Japanese phone number must be prefixed with zero. In this number format, known as the national format, it is not necessary to include the Japan country code.

Caller ID

Inbound
Inbound call receives originator's Caller-ID
Domestic+E.164
InternationalE.164 (Non-guaranteed)
Toll-Free+E.164
Outbound
Outbound call preserves sent Caller-ID
DomesticLocal
International+E.164
Toll-FreeLocal

DTMF

Inbound
Inbound call receives DTMF from PSTN
RFC.2833 formatYes
Outbound
Outbound call sends DTMF to PSTN
RFC.2833 formatYes

Emergency Calling

Outbound
Ability to make Emergency Calls
Emergency servicesNo

For the benefit of all our customers, these guidelines are provided to help you comply with applicable requirements and to help ensure Twilio's platform remains compliant with global telecommunications ecosystem requirements. These guidelines represent our current understanding of common compliance requirements generally applicable to Twilio and its customers, and do not constitute legal advice. By posting these guidelines, Twilio makes no assurances regarding the legal compliance of your application built using our APIs. You are expected to understand and abide by all compliance obligations applicable to your specific application. You should check these pages regularly for updates as telecommunications ecosystem requirements continue to evolve and change, and the information below may be updated or changed without notice.