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Application Note

Text-to-Speech Voice Mappings in Telestra 8.X (#134)

December 1, 2023

With the recent Telestra 8.0.0 release, ASTi transitioned from Acapela, a third-party text-to-speech (TTS) service, to a new TTS engine and voice library. As a result, you may notice that your TTS voices sound slightly different in Telestra 8.X. If you currently use Acapela with Telestra 7.X and earlier, you might want to update the voice mappings in your application's host code when you upgrade.

The following table defines Acapela/Telestra voice mappings in Telestra 8.X:

Legacy Acapela Voice New Telestra Voice
Laura Betina
Lisa Giuli
Karen Tara
Will Neil
Sharon Tara
Ryan Chris
Micah Giordan
Tyler Tyler
Tracy Betina
Saul Martin
Rod Neil

If you don't specify any voices in your host code, Telestra uses “Kerrenton'' as the default. ASTi recommends predefining selections to avoid surprises caused by legacy mappings. To explore the new voice offerings and listen to samples, go to the Text to Speech page in the Telestra web interface. To learn more about TTS in Telestra, go to “Text to Speech” in the Telestra Web Interface User Guide.

Thank you for your understanding and cooperation during this transition. If you have any questions or require assistance, please reach out to ASTi's Support team at