FOSS XMPP client "Conversations" was updated to version 2.16.7. This update added a timeout to call initiation. The code is licensed using GPLv3.0. Conversations is a privacy friendly alternative to SMS. It's available for Android on F-Droid. It allows for end-to-end encryption with OMEMO or OpenPGP, has the ability to send and receive images, make encrypted audio and video calls, and more.
The main website for the project is here:
The source code is hosted on Codeberg:
https://codeberg.org/inputmice/Conversations
The change log for this update is here:
https://codeberg.org/iNPUTmice/Conversations/src/branch/master/CHANGELOG.md
The F-Droid page for Conversations is here:
https://f-droid.org/packages/eu.siacs.conversations/
The main developer, Daniel Gultsch, has a presence on Mastodon:
https://gultsch.social/@ daniel
If you wish to help the project financially the main developer accepts donations through Liberapay, Github, and Paypal: