I try to build custom attended transfer logick with kamailio and asterisk. My backend can do all work (include interconnect between asterisk servers), so I need to fully handle REFER in kamailio. But I can't send back NOTIFY message with the result of a transfer. Is any way to do this logic inside kamailio or I need to write external SIP service? My route looks like: if(!route(FROM_NODE)) { if(is_method("REFER")) { xlog("L_NOTICE", "Got REFER in call ci:$ci for $(hdr(Refer-To){nameaddr.uri})"); sl_send_reply("202", "Accepted [1]"); # HERE I MAKE async request and want to send NOTIFY back exit; } } -- Skype: konstantin.tumalevich