I tested Mobicents (RestComm) Sip-Servlet (v 4.0.21) in proxy mode. Request "CANCEL" sent from UAC to UAS via Proxy Server (Apache Tomcat 8.0 + MSS 4.0.21) is not forwarded to UAS. The Sip-Servlet just returns 200 Cancelling to UAC and calls proxy.cancelAllExcept.
What could be reason of such behavior?
Thanks, David