Avatar is not scaled, therefore for contacts with huge avatars the call ui is unusable
I think that's a duplicate of bug 282273.
No, different application. Call UI vs contact applet.
Thank you for the bug report. As this report hasn't seen any changes in 5 years or more, we ask if you can please confirm that the issue still persists. If this bug is no longer persisting or relevant please change the status to resolved.
Dear user, unfortunately Telepathy is no longer maintained. Please migrate to another solution, e.g. for Jabber a possibility is Kaidan, for Matrix a candidate is NeoChat.