Hi! I've some troubles with the radius authentication. If the radius authentication takes longer than 0.5 secondes, the client retransmits the message and causes another radius request. I tried to catch the retransmissions using t_newtran (ser.cfg snippet at the end of this email). This works fine for messages with credentials, but for the initial REGISTER messages (without credentials), which will be answered by www_challenge(), this causes the following warning: WARNING: script writer didn't release transaction Looks like www_challenge works only stateless. Is there a way to handle the challange stateful? Btw: I'm still using 0.8.12 - is this solved in newer versions? regards, klaus if ( !t_newtran()) { sl_reply_error(); xlog("L_ERR", "error creating new transaction\n"); break; }; xlog("L_INFO", "creating new transaction ... done\n"); if (!radius_www_authorize("")) { www_challenge("", "0"); break; }; if (!check_to()) { if (!t_reply("403", "Forbidden - please use proper To")) { sl_reply_error(); }; break; }; if(!save("location")) { if (!t_reply("500", "Error saving contact")) { sl_reply_error(); }; break; }; break;