Guidelines

Hungary (HU)

Locale Summary
Locale name	Hungary
ISO code The International Organization for Standardization two character representation for the given locale.	HU
Region	Europe
Dialing code The dialing prefix used to establish a call or send an SMS from one locale to the given locale.	+36

Reachability Can Twilio complete calls to numbers in this locale?	Inbound Ability to call numbers. Calls are inbound from PSTN to Twilio numbers.	Outbound Ability to call non-Twilio numbers. Calls are outbound from Twilio to PSTN numbers.
Domestic For calls within the locale	Yes	Yes
International Can in-locale numbers be reached from outside the locale?	Yes	Yes
Toll-Free Can in-locale Toll-Free numbers be reached from within the locale?	Yes	No
Outbound restrictions Regulatory and/or Carrier restrictions on outbound calls made from Twilio to non-Twilio numbers in this locale	Following an amendment to Decree 4/2012 (I.24), calls made to Hungary using fixed or geographic numbers (like +36 1-9...) as a CLI (Calling Line Identification) are now likely to be blocked by local carriers, as of October 15, 2025. This will expand to mobile numbers (like +36 20, 30, 70...) starting June 1, 2026. Calls made with Transit Caller ID and Verified Caller ID will be delivered by Twilio on a best-effort basis when customers use a Hungarian CLI.
Outbound requirements Conditions that must be met before outbound calls are allowed from Twilio to non-Twilio numbers in this locale	For calls made into Hungary using Verified Caller ID or Transit Caller ID, customers should avoid using Hungarian numbers (+36 1-9… and +36 20, 30, 70...) as CLI. For calls made into Hungary customers should use international numbers (use Twilio Console to buy a number).
Best practices Useful tips for best performance on outbound calls to non-Twilio numbers in this locale	N/A

Caller ID Can Twilio complete calls to numbers in this locale?	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	+E164	Local (Non-guaranteed)
International Can in-locale numbers be reached from outside the locale?	+E164 (Non-guaranteed)	+E164
Toll-Free Can in-locale Toll-Free numbers be reached from within the locale?	+E164	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?	Yes	Yes

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.