> For the complete documentation index, see [llms.txt](https://cookbook.denovolab.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cookbook.denovolab.com/troubleshooting/one-way-audio-with-sip-client-testing/using-zoiper-to-resolve-nat-issue.md).

# Using Zoiper to resolve NAT issue

Zoiper is a good SIP client with support for NAT.  You can setup like this:

![](/files/2RtAHqre9RV6ANpXN0He)