After trying to connect to conference call/accept multiple call from other, call ended with error message:
Error occured
Unable to establish a call
488 Not Acceptable Here
Error parsing SDP
Release Notes: 2014/04/pidgin-sipe-release-1181
Release Notes: 2014/06/pidgin-sipe-release-1182
good work. I applied this patch on top of my fedora package, and the problem is gone for me.
No negative test result was posted within 6 days. Therefore, I'm closing the issue as fixed.