# NAT, idle timers, and split tunnels · Worked example

- List NAT count, UDP timer, and whether Five9 is inside the tunnel.
- NAT layers
- Idle timer
- Split-tunnel check
- You did not start with the dialer mode.

## 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.
- [RFC 1918](https://www.rfc-editor.org/rfc/rfc1918). rfc. last checked 2026-10.
- [RFC 3261](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 768, User Datagram Protocol](https://www.rfc-editor.org/rfc/rfc768). rfc. last checked 2026-10.
- [RFC 4787, NAT behavior for UDP](https://www.rfc-editor.org/rfc/rfc4787). rfc. last checked 2026-10.