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AI phone agents in German

ThunderPhone supports German across the customer experience: agents speak and understand German on calls, the dashboard has a German interface, and the docs site has a dedicated German edition. A team can build, operate, and answer entirely in German.

German is one of ThunderPhone's 47 supported voice languages. It is an included language, so selecting German does not add a language surcharge to the Spark, Bolt, or Storm engine rate.

German voice availability and pricing

The current catalog includes eight voices that support German:

  • six multilingual voices included on the German language path; and
  • two premium German voices, Viktoria and Nico.

Because German is included, calls bill at the engine rate alone — Spark 2¢, Bolt 5¢, or Storm 9¢ per minute, pay as you go, no subscription. The optional premium German voices add 3¢ per minute on top of the selected engine rate. All figures are illustrative and exclude telephony and other optional charges.

Preview candidate voices in the builder, then test them against real calls. Evaluate long compound words, names and street addresses, numbers and dates read aloud, English loanwords, and the register your callers expect — whether the agent should use Sie or du belongs in your prompt, not to chance.

German in the dashboard and documentation

German is a shipped dashboard locale, not just a call setting. Teams can configure prompts, review calls and transcripts, manage integrations, and operate the account in the German interface.

ThunderPhone also publishes a dedicated German documentation edition on its docs site, so German-speaking builders get localized product guidance alongside the German-speaking agent experience.

German and English in one call

An agent can start in German and switch automatically when a caller moves into a configured additional language such as English — and switch back when the caller returns to German. The reverse also works for an English-first line serving German-speaking callers.

The chosen voice must support every selected language. For bilingual lines, test full calls in both languages plus realistic switch points: a caller who starts in German but gives an email address, product name, or technical explanation in English is a common case worth rehearsing before launch.

Sample German call experience

The following flow is written in English to describe the caller experience.

Agent starts in German: Greets the caller, identifies the business, and asks how it can help.

Caller answers in German: Says they need to reschedule Thursday's appointment.

Agent continues in German: Confirms the caller's name, looks up the approved scheduling action, and offers two available times.

Caller switches to English: "Could you send the confirmation to my work email?"

Agent switches to English: Repeats the email address back and confirms where the notice will be sent.

Caller returns to German: Confirms the new time and asks what to bring to the appointment.

Agent returns to German: Answers from the approved knowledge source, repeats the confirmed date and time, and ends the call according to the business's instructions.

The language switch happens within the same call; no separate number or phone-tree language menu is required.

Build and test a German agent

  1. Set German as the primary language, or add it to an agent's additional languages.
  2. Choose one of the eight voices that supports the full selected language set.
  3. Write the operating prompt with the form of address, questions, tool actions, and fallback behavior you expect.
  4. Attach approved German source material where localized answers matter.
  5. Run German-only, English-only, and mixed-language simulations.
  6. Review pronunciation, transcripts, tool actions, transfers, and escalation behavior before deployment.

Frequently asked questions

Does ThunderPhone support German voice calls?

Yes. German is one of ThunderPhone's 47 supported voice languages and currently has eight compatible voices in the catalog.

Does German cost extra as a language?

No. German is an included language, so it adds no language surcharge to the engine rate — Spark 2¢, Bolt 5¢, or Storm 9¢ per minute, before telephony and other optional charges.

Are premium German voices available?

Yes. The catalog currently lists two premium German voices, Viktoria and Nico, each adding 3¢ per minute. The other six compatible voices use the included German language path.

Is the dashboard available in German?

Yes. German is a shipped dashboard locale.

Are the ThunderPhone docs available in German?

Yes. ThunderPhone publishes a dedicated German documentation edition on its docs site.

Can a German agent switch to English during a call?

Yes. Add English as an additional language and choose a voice that supports both. The agent switches automatically when the caller changes language mid-call.