Thabks again.
I've sent the log in a private mail.
Basically the logs ends with this:
11:41:38,801 INFO WCS4CallbackHandler - Timer-613 finish SipCall{id='6D35EB50-6EEB-4F8A-BA67-8A9AE3914374', cost='', callee='5xxxxxxxxx6', calleeVisibleName='<sip:xxxxxxx@xxxx>', caller='918883er'...