With federal inmate texting, messages are relayed as a result of the federal Corrlinks/TRULINCS procedure

https://prisontextapp543.rivetgarden.com/posts/why-families-choose-the-best-inmate-text-app-for-federal-inmates

With federal inmate texting, messages are relayed using the federal Corrlinks/TRULINCS method, and replies can go back to the outdoor person as primary textual content messages.