Hi! I'm registering clients to freeswitch via a Kamailio proxy. Kamailio sends a Path: header to freeswitch, and calls are working fine, but I'm struggling to get chats working. I'm stuck trying to figure out how to send the path information back to Kamailio in a MESSAGE with mod_sms. Adding a "path" header to the event is ignored. I have a python chatplan, I have found that if I do something like: event = ESL.ESLevent("CUSTOM", "SMS::SEND_MESSAGE") event.addHeader("to", "extention@kamailio_server;received=sip:ip_addr:port") Then Freeswitch will send the MESSAGE to the kamailio server with a To line: To: <sip:extention@kamailio_server>;received=sip:ip_addr:port I guess I could go about having Kamailio parse this, but is this the way to go? It seems messy. Any ideas? Thanks!