### Answer When changing the

language

parameter in your agent, you're modifying which language and dialect the speech recognition operates in [(1) ]() [(2) ]() [(3) ]() . The

language

field specifies the speech recognition optimization—for example,

en-GB

optimizes for British English, while

en-US

is the default . For pronunciation issues specifically, Retell AI provides the

pronunciation_dictionary

feature, which allows you to define custom pronunciations for words or phrases to guide audio synthesis . This can help address pronunciation inconsistencies across different languages . Additionally, the

normalize_for_speech

setting (when set to true) converts text elements like numbers, currency, and dates to their spoken form before audio generation, which can improve speech synthesis consistency . While the documentation doesn't explicitly state that prompts must be rewritten when changing languages, the pronunciation issues you're experiencing suggest that language-specific adjustments may be beneficial. Consider using the

pronunciation_dictionary

to define correct pronunciations for problematic words in your target language .

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.

​ To learn more, see the sources I considered: [[1] Create Voice Agent](https://docs.retellai.com/api-references/create-agent) [[2] List Voice Agents](https://docs.retellai.com/api-references/list-agents) [[3] Update Voice Agent](https://docs.retellai.com/api-references/update-agent) ​