# Video/Audio Calls over XMPP ## Why you don't receive the Call symbol in your Mobile XMPP-App With modern mobile apps like [Conversations.im](https://conversations.im) or its fork [Blabber.im](https://blabber.im) you are able to make __Audio/Video-Calls__ from user to user via _xmpp_. That requires of course that both accounts are on a properly configured xmpp-server. You can check your server at [Conversations' Compliance Test](https://compliance.conversations.im). If you host your own xmpp server like me you will have to [struggle a little with things like STUN and TURN](https://discuss.freedombox.org/t/building-configuring-a-turn-server/) to get that Call feature going but at least it's possible to manage and documentation [how to configure your server](https://gist.github.com/iNPUTmice/a28c438d9bbf3f4a3d4c663ffaa224d9) accordingly is growing. ### A very important information ... from this docs has to be highlighted as it cost me a lot of time and troubles: Even if your __servers are perfectly configured__ you will first receive __no Call symbol__ in those apps! At least this is the case for Blabber.im. Both accounts have to be online for it to appear. In our case this meant that __I had to write my friend a text message and not before she answered by texting the phone symbol popped up immediately.__ Until this happened I was convinced that something is wrong with my ejabberd.yml and fiddled around - which obviously was absolutely unnecessary.