# Digital text can be blocked · Quiz

- Avast is named as
- Voice works, chat text does not. First documented suspect?
- Efficiency Mode's documented symptom is
- The fix for blocked text is
- You should change both settings at once without a note. True or false?

## Sources and go deeper

- [Technical requirements PDF](https://documentation-be.five9.com/bundle/five9-technical-requirements/raw/resource/enus/five9-technical-requirements.pdf). vendor. last checked 2026-10. Fetched for this lab in October 2026. Re-read before you buy hardware or open a firewall.
- [ITU-T E.164, international public telecommunication numbering](https://www.itu.int/rec/T-REC-E.164). standard. last checked 2026-10.