Spain introduced the dedicated 400 XXX XXX numbering range for identifiable outbound commercial calls. From 17 October 2026, businesses that fall within the scope of Spain’s Law 10/2025 must use the designated 400 range for applicable commercial calls.
Telnexx provides Spain 400 numbers for business use with SIP connectivity, so the number can be integrated with an existing PBX, dialer or contact-center platform. The 400 range is outbound-only: customers can see the 400 caller ID, but they cannot call the number back.
What is a Spain 400 number?
A Spain 400 number is a nine-digit non-geographic Spanish number created specifically for commercial outbound calling. Its purpose is to make the commercial nature of a call clear to the recipient and separate commercial calling from customer-service and ordinary business traffic.
When did the requirement take effect?
The dedicated 400 range became mandatory for applicable commercial calls from 17 October 2026 after the transitional period established by the Spanish authorities. The official numbering decision is published in the Spanish Official State Gazette (BOE).
Read the official BOE decision on the Spain 400 range.
Who may need a Spain 400 number?
The requirement does not automatically apply to every company calling a Spanish customer. It applies to businesses and calling scenarios covered by the relevant Spanish consumer-service legislation. This includes certain essential-service providers and larger consumer-facing businesses that meet the statutory criteria.
Telnexx provides the telecommunications service and SIP configuration. Each customer remains responsible for determining whether the legal requirements apply to its specific business and calling activity.
Outbound sales and contact-center use
Spain 400 numbers are particularly relevant for outbound sales teams, contact centers, telesales operations, customer-acquisition campaigns and lead-qualification workflows. The number can be presented as the outbound caller ID while the actual calls are handled by an existing PBX, SIP trunk or dialer.
Use a separate number for inbound calls
Because Spain 400 numbers are outbound-only, businesses that need customer callbacks should use a separate Spanish virtual number for inbound communication. Telnexx can provide both parts of the setup: a 400 number for applicable outbound commercial calls and a Spanish local or national number for incoming calls.
See also Spain virtual phone numbers and SIP Trunk.
SIP integration
A typical setup is straightforward: your sales team or call center uses its existing PBX or dialer, the call is delivered through SIP, and the Spain 400 number is presented to the recipient as the commercial caller ID. This makes it possible to add the regulatory numbering layer without replacing the whole telephony platform.
Need a Spain 400 number?
Contact Telnexx with your business use case, expected call volume, PBX or dialer platform and required number of simultaneous calls. We can help configure the telephony side of the solution and, if required, add a separate Spanish number for inbound calls.
Regulatory note: eligibility and permitted use depend on the specific business and calling scenario. Telnexx provides telecommunications services and does not provide legal advice.
