Locale Summary
| Locale name | Singapore |
|---|---|
| ISO code | SG |
| Region | Asia |
| Dialing code | +65 |
Reachability
| Inbound Ability to call numbers in Singapore | Outbound Ability to call non-Twilio numbers in Singapore | |
|---|---|---|
| Domestic | Yes | Yes |
| International | Yes | Yes |
| Toll-Free | Yes | No |
| Outbound restrictions | Outbound calls from toll-free numbers are not allowed. From May 2, 2022, for outbound calling to Singapore destinations, please use Twilio numbers as the caller ID ( Making calls using non-Twilio phone numbers via the Verified Caller ID service will no longer be supported in alignment with the measures introduced by IMDA to strengthen protection against scams. The call blocking is the Implementation of Measures to Address Spoofed Calls regulatory code which went into effect in 2020. The caller ID for Level 3 numbers will be displayed in E.164 format unless the registered address for the number is an address within Singapore. The registered address is the address submitted to the Regulatory Compliance (RC) bundle during phone number provisioning. | |
| Outbound requirements | N/A | |
| Best practices | N/A | |
Caller ID
| Inbound Inbound call receives originator's Caller-ID | Outbound Outbound call preserves sent Caller-ID | |
|---|---|---|
| Domestic | +E.164 | +E.164 |
| International | E.164 (Non-guaranteed) | +E.164 |
| Toll-Free | +E.164 | N/A |
DTMF
| Inbound Inbound call receives DTMF from PSTN | Outbound Outbound call sends DTMF to PSTN | |
|---|---|---|
| RFC.2833 format | Yes | Yes |
Emergency Calling
| Outbound Ability to make Emergency Calls | ||
|---|---|---|
| Emergency services | No | |
Reachability
| Inbound Ability to call numbers in Singapore | |
|---|---|
| Domestic | Yes |
| International | Yes |
| Toll-Free | Yes |
| Outbound | |
| Domestic | Yes |
| International | Yes |
| Toll-Free | No |
| Outbound restrictions | Outbound calls from toll-free numbers are not allowed. From May 2, 2022, for outbound calling to Singapore destinations, please use Twilio numbers as the caller ID ( Making calls using non-Twilio phone numbers via the Verified Caller ID service will no longer be supported in alignment with the measures introduced by IMDA to strengthen protection against scams. The call blocking is the Implementation of Measures to Address Spoofed Calls regulatory code which went into effect in 2020. The caller ID for Level 3 numbers will be displayed in E.164 format unless the registered address for the number is an address within Singapore. The registered address is the address submitted to the Regulatory Compliance (RC) bundle during phone number provisioning. |
| Outbound requirements | N/A |
| Best practices | N/A |
Caller ID
| Inbound Inbound call receives originator's Caller-ID | |
|---|---|
| Domestic | +E.164 |
| International | E.164 (Non-guaranteed) |
| Toll-Free | +E.164 |
| Outbound Outbound call preserves sent Caller-ID | |
| Domestic | +E.164 |
| International | +E.164 |
| Toll-Free | N/A |
DTMF
| Inbound Inbound call receives DTMF from PSTN | |
|---|---|
| RFC.2833 format | Yes |
| Outbound Outbound call sends DTMF to PSTN | |
| RFC.2833 format | Yes |
Emergency Calling
| Outbound Ability to make Emergency Calls | |
|---|---|
| Emergency services | No |
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.