Hi all, I've read on the WeSIP website that the support is made through openser mailing-list, so here i'am. I've problem with the SIP Servlet in b2bua mode, the problem is that the ACK is not forwarded to the other call-leg. INVITE, 183 session progress, 180 ringing are correctly forwarded but the ACK no. In the debug i can't see too much information about the request is not forwarded. Attached there is a .zip with all the log, trace and configuration. thanks for the support, :tele