Hi Daniel, Issue got solved. I am just sharing it. My requirement is I have to parse the SDP from cfg which is coming in 200 OKEY(Initiated by UAC once the called party answers the call). On reply route we can capture the responses for those requests which we set t_on_reply();(externally we have to call for each request). But reply route we can capture all replies. So that we can parse our required headers or msg body. Regards Surendra ******************************