home.md

@@ -8,14 +8,31 @@ Chrome / Chromium of Firefox.
 
 ### Is there an app?
 
-Use the Jitsi meet App for your smartphone. In settings, set fairmeeting.net as your server.
+Use the Jitsi Meet App for your smartphone. In settings, set fairmeeting.net as your server. It supports all features like a conference session in a browser, except playing or showing a Youtube video.
 
 ### Where do I find more information on the service?
 
-See the [fairmeeting product page](https://www.fairkom.eu/fairmeeting) for usage condition and additional information.
+See the [fairmeeting product page](https://www.fairkom.eu/fairmeeting) for usage conditions and additional information.
 
 You find some more documentation at the [fairchat FAQs](https://fairchat.eu/fairmeeting) (which has fairmeeting embedded). 
 
+### Which ports do you use?
+
+Media streams go with RTP UDP through ports 10000-20000. If your firewall is blocking those, as a fallback, https TCP 443 is being used (with poorer quality).
+
+On a terminal, you can test if you can reach the UDP ports with the netcat command:
+
+```
+nc -vuz media.fairmeeting.net 10000
+Connection to media.fairmeeting.net 10000 port [udp/*] succeeded!
+```
+
+There may be stacked router and firewall stacks, which make it impossible to send media streams. In some organisations any media stream may be blocked. Talk to your network administrator to allow media streams to IP 51.38.117.249.
+
+### Can I record a session?
+
+Currently we do not offer recording of a stream. You may try to record your session with e.g. vokoscreen. 
+
 ### I have a question
 
 Ask at the [fairapps](https://fairchat.net/channel/fairapps) chat channel. Someone from the community or a technician may help.