Announcement then call transfer This application plays an announcement and then REFERs the caller to either the uri configured in the Refer-To session parameter, or, if his is not set, the request URI of the first INVITE. If refer is not accepted, succeeds, or fails, a BYE is sent. Example ser configuration appends: #appends: parameter for announce_transfer modparam( "tm", "tw_append", "announce_transfer_headers:P-App-Param=avp[$refer_to]") # appends for REFER NOTIFYs modparam( "tm", "tw_append", "notify_headers:hdr[Content-Length];hdr[Content-Type];hdr[Event];msg[body]") Example of invoking announce_transfer within route: if (method != "ACK" && method != "INVITE" && method != "CANCEL" && method != "INFO" && method != "NOTIFY" && method != "BYE" ){ log("unsupported method\n"); sl_send_reply("500","unsupported method"); break; } if (method == "NOTIFY") { if (!t_write_unix("/tmp/sems_sock","announce_transfer/notify_headers")){ log("could not contact announce_transfer\n"); t_reply("500","could not contact media server"); break; } break; } if (method == "INVITE") { avp_write("Refer-To=sip:callme@example.com","$refer_to"); if (!t_write_unix("/tmp/sems_sock","announce_transfer/announce_transfer_headers")){ log("could not contact announce_transfer\n"); t_reply("500","could not contact media server"); break; } break; } if (!t_write_unix("/tmp/sems_sock","announce_transfer")){ log("could not contact announce_transfer\n"); t_reply("500","could not contact media server"); break; }