No audio in meeting

[AlexLoes]

Hello

First, thank you for the SIPE plugin. It is fantastic.

I use pidgin 2.13.0 with libpurple 2.13.0 and sipe 1.25.0.2 on Debian 10.
I can establish a voice call and join a scheduled conference (A new window opens showing a chat). But there is no media possiblle. A click on Conversation->Media shows a grayed Audio Call and is therefore not available. Is there another way to have voice in a scheduled conference (Skype meeting). Skype WebApp doesn't work in linux.

Thank you

Al