# A contact center is not a phone system · Ecosystem



## Sources and go deeper

- [Planning your implementation](https://documentation.five9.com/bundle/basic-admin/page/basic-admin/intro/planning-your-implementation.htm). vendor. last checked 2026-10.
- [Skill groups](https://documentation.five9.com/bundle/basic-admin/page/basic-admin/skill-groups/_ch-skill-groups.htm). vendor. last checked 2026-10.
- [RFC 3261, SIP: Session Initiation Protocol](https://www.rfc-editor.org/rfc/rfc3261). rfc. last checked 2026-10.
- [Interactive voice response](https://en.wikipedia.org/wiki/Interactive_voice_response). wikipedia. last checked 2026-10.