How to retrieve docusign for SIT url

We're currently in the staging phase, and I can't receive DocuSign data on our SIT environment because its URL is an internal ".local" address that DocuSign can't reach from the public internet.

In local development, I use ngrok to expose my localhost so DocuSign can reach it, which works fine. But if I do the same for SIT, I'd have to keep ngrok running continuously, which doesn't seem like the right approach for a shared environment.

Does anyone have suggestions on the best way to handle DocuSign Connect webhooks for an internal SIT environment like this?