[Users] Locally generated single-hop ACKs with Route headers

Hello, I am using OpenSER v1.0.1 I am currently testing with proxies running OpenSER. I have a problem with ACK messages generated and routed for scenarios where an inititiated call session fails to establish between A and B parties e.g. Unsuccessful No Answer, Unsuccessful Busy. The ACK messages are single hop locally generated responses to the sip error message e.g. '487 Request Terminated', '486 Busy'. The behaviour I observe is that Route headers are 'remembered' from the initiating INVITE message and inserted into the ACK messages automatically generated by OpenSER. This extra Route header causes problems with routing and the generation unwanted messages (error message resends) in addition to expeceted scenario call-flow. It is also visible at the B-Party. I would like to either prevent the creation of, or remove this Route header. I have tried to remove this header using the OpenSER available methods, but this has failed. I have noticed that the known issue described in the document: SIP Express Router v0.8.8 - Developer's Guide under section: 9.6.4 Known Issues appears to describe this problem. "local ACK/CANCELs copy'n'pastes Route and ignores deleted Routes" Has this issue been resolved? If so, from what version of OpenSER? If it has not been resolved, is there a way to resolve or workaround this problem? Best regards, Andrew Augustin