# TLS, and ports that are not universal

- Unencrypted APIs are not the story. TLS 1.2 is required. TLS 1.1 is not supported. The requirements also list TLS 1.3 inbound ciphers: AES-128-GCM, AES-256-GCM, and CHACHA20.
- Studio portal hosts and Studio SIP ports live in the Studio section of that PDF: UDP 5060, TCP 5061 described as beta, proxy UDP 5189 and TCP 5161, a legacy UDP 5188, plus RTP ranges. Do not paste those Studio numbers onto every VCC ITSP trunk. If the trunk guide does not say them, they are not the trunk.
- Require TLS 1.2
- Keep Studio ports in the Studio box

## 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.
- [SIP trunk options chapter](https://documentation.five9.com/bundle/technical-reqs/page/technical-reqs/SIP-trunk-options/_ch-five9-sip-trunk-options.htm). vendor. last checked 2026-10.
- [IANA service names and port numbers](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml). ports. last checked 2026-10.
- [RFC 3261, SIP: Session Initiation Protocol](https://www.rfc-editor.org/rfc/rfc3261). rfc. last checked 2026-10.
- [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). rfc. last checked 2026-10.
- [RFC 3551, RTP profile for audio and video](https://www.rfc-editor.org/rfc/rfc3551). rfc. last checked 2026-10.
- [ITU-T G.711](https://www.itu.int/rec/T-REC-G.711). standard. last checked 2026-10.
- [RFC 8446, TLS 1.3](https://www.rfc-editor.org/rfc/rfc8446). rfc. last checked 2026-10.
- [RFC 9293, Transmission Control Protocol](https://www.rfc-editor.org/rfc/rfc9293). rfc. last checked 2026-10.
- [RFC 768, User Datagram Protocol](https://www.rfc-editor.org/rfc/rfc768). rfc. last checked 2026-10.
- confirm. Studio TCP 5061 is described as beta in the PDF read for this lab. Confirm before you depend on it. last checked 2026-10.