Odorik app for iPhone, iPod
Since this app is defunct since the middle of last year, I have created a single-page web app (together with a Shortcuts workflow) to replace it.
Odorik was an iOS application that allowed you comfortably set up callbacks through your account with Czech VOIP provider of the same name, Odorik.cz (run by miniTEL s.r.o.).
While the app’s support for Odorik’s services wasn’t 100% it has the basic
functionality of setting up callbacks and displaying call history.
rest of the features (namely sending SMS) will follow in future versions
of the app.
The app is no longer available on the AppStore, but you can check the archived source code on GitHub; it’s released under GPLv2.
There’s no need for any support anymore.