@dcatoffm Please do not use c0nnect. This is an outdated fork of #Conversations_im with several severe security issues (simply due the fact the developers haven't kept up with fixes I made to Conversations over the years.)
These days Conversations and aTalk are the only actively maintained Android clients that aren't just bad copies of something else.
In terms of calls not working this does depend on your server (and network situation)
Try conversations.im (the server) for example.