Double NAT

There are two different NAT layers to check. An extra router behind the Starlink router can create local double NAT. Separately, Starlink Residential and Roam use carrier-grade NAT (CGNAT) upstream. Removing the first does not remove the second. If you have your own router behind Starlink, ask your network/phone provider to check the layout. On supported equipment, Starlink bypass mode lets your own router manage the network and removes the Starlink router's local routing layer. It disables Starlink Wi-Fi, so make sure the replacement router is ready. Bypass mode is not a CGNAT off switch. For the one-way audio, ask your VoIP provider to inspect SIP/RTP and NAT traversal settings on the actual phone/router setup. One-way audio alone does not prove NAT is the cause. Starlink also documents that CGNAT session limits can affect calls. If your provider confirms that a public IPv4 address is required, discuss an eligible Priority plan and the public-IP configuration with Starlink; do not assume an upgrade alone guarantees a cure. What Starlink plan, router and VoIP provider are you using? Please omit public IPs and account credentials. Official sources: CGNAT and call symptoms: https://starlink.com/support/article/bb372afe-7dd4-ae54-a2af-29cf63d24ddf Bypass mode: https://starlink.com/support/article/a0fe8d51-32f7-d2b9-d74a-801e31ad9f6a IP addressing: https://starlink.com/support/article/1192f3ef-2a17-31d9-261a-a59d215629f4 Further help from Starlink Tips: - Guide: Starlink Double NAT: How to Diagnose It and Pick the Right Fix — https://starlink-tips.com/guides/troubleshooting-fixes/starlink-double-nat-diagnose-right-fix - Q&A: What is double NAT on Starlink, and should I fix it? — https://starlink-tips.com/questions/starlink-double-nat-explained - Guide: Does Starlink Work With VoIP? Home Phones and Business Calls — https://starlink-tips.com/guides/tips-tricks/does-starlink-work-with-voip-home-business-calls Includes checks for one-way audio and working with your phone provider. - Video: How To Bypass The Starlink Router To Use Your Own — https://starlink-tips.com/videos/starlink-hardware-accessories/how-to-bypass-the-starlink-router-to-use-your-own DISHYtech demonstrates Gen 2/Gen 3 router bypass. Use instructions for your own hardware; this addresses local routing, not upstream CGNAT.