[SR-Users] Replacing a message body received with a subsequent message sending out of kamailio

Hi All, I have a architecture of pjsip,kamailio,freeswitch and one external server. When kamailio is receiving "407"-proxy authentication required from the external server it sends to freeswitch and received "407" from freeswitch.But when replying back to kamailio the freeswitch is adding some extra headers in that "407". Now I need to send the message from kamailio to pjsip the same thing received from external server.So I need to replace the message received from external server with the message received from freeswitch at kamailio. I am using redis db to store the message.Can anybody help me how to configure the kamailio so that it will replace the message with freeswitch message and send the original message received before i.e. from external server. Any suggestion will be highly appreciated. Thanks, Narayan +91-9035438928