> 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:

![](https://4102392624-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MXPCJcszvw7MAuHjiRr%2Fuploads%2FDHe5i3OVakv6JZcEA3Di%2Fimage.png?alt=media\&token=6c0245a2-809e-4852-8ba8-a53141873b0b)