# A routing review you can finish · Sources and go deeper



## Sources and go deeper

- [Skill groups](https://documentation.five9.com/bundle/basic-admin/page/basic-admin/skill-groups/_ch-skill-groups.htm). vendor. last checked 2026-10.
- [Automatic call distributor](https://en.wikipedia.org/wiki/Automatic_call_distributor). wikipedia. last checked 2026-10.
- [ITU-T E.164, international public telecommunication numbering](https://www.itu.int/rec/T-REC-E.164). standard. last checked 2026-10.
- [Interactive voice response](https://en.wikipedia.org/wiki/Interactive_voice_response). wikipedia. last checked 2026-10.