Guidelines

China (CN)

Locale Summary
Locale name	China
ISO code The International Organization for Standardization two character representation for the given locale.	CN
Region	Asia
Dialing code The dialing prefix used to establish a call or send an SMS from one locale to the given locale.	+86

Reachability Can Twilio complete calls to numbers in this locale?	Inbound Ability to receive inbound calls to Twilio numbers from the PSTN.	Outbound Ability to place outbound calls to non-Twilio numbers.
Domestic For calls within the locale	No	No
International Can in-locale numbers be reached from outside the locale?	No	No
Toll-Free Can in-locale Twilio Toll-Free numbers be used within the locale?	No	No
Outbound restrictions Regulatory and/or Carrier restrictions on outbound calls made from Twilio to non-Twilio numbers in this locale	Outbound calls to Mainland China are not supported.
Outbound requirements Conditions that must be met before outbound calls are allowed from Twilio to non-Twilio numbers in this locale	N/A
Best practices Useful tips for best performance on outbound calls to non-Twilio numbers in this locale	N/A

Caller ID The format of the From number.	Inbound Inbound call receives originator's Caller-ID. Calls are inbound from PSTN to Twilio numbers.	Outbound Outbound call preserves sent Caller-ID. Calls are outbound from Twilio to PSTN numbers.
Domestic For calls within the locale	N/A	N/A
International Can in-locale numbers be reached from outside the locale?	N/A	N/A
Toll-Free Can in-locale Toll-Free numbers be used within the locale?	N/A	N/A

DTMF	Inbound Inbound call receives DTMF from PSTN. Calls are inbound from PSTN to Twilio numbers.	Outbound Outbound call sends DTMF to PSTN. Calls are outbound from Twilio to PSTN numbers.
RFC.2833 format Is RFC.2833 DTMF format supported?	N/A	N/A

Emergency Calling Calls are outbound from Twilio to Emergency (911/933) numbers.	Outbound Ability to make Emergency Calls. Calls are inbound from PSTN to Twilio numbers.
Emergency services Are calls to Emergency Services Numbers in the locale allowed over Twilio?	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.