Hi, I have setup openser-1.1.1-tls and using it along with Mediaproxy. I have several clients (UAC) which are Grandstream HT486 rev2.0. All clients are behind consumer grade routers such as Linksys, Dlink etc. Few of our clients are over seas and they do see: 1. Frequent power outages 2. ADSL (WAN) link drops at client end Now what we see for item 1, there is no issue, usually power goes off to ADSL modem, router and UAC and it all come back up nicely. For item 2 we see that we can see when WAN goes out and comes back with a diff WAN IP (ADSL): A. UAC sends register request to openser B. openser says "Trying 100" C. Then openser challenges the client with a 401 unauthorized D. After some time UAC resends Register request and this goes on and on and on...till we ask some one to power the UAC (only) off and power it back on. Is there a way to get around this issue? I am using the following Register sequence in openser: # ----------------------------------------------------------------- # REGISTER Message Handler # ---------------------------------------------------------------- sl_send_reply("100", "Trying"); if (!search("^Contact:[ ]*\*") && client_nat_test("7")) { setflag(6); fix_nated_register(); force_rport(); }; if (!www_authorize("","subscriber")) { www_challenge("","0"); return; }; if (!check_to()) { sl_send_reply("401", "Unauthorized"); return; }; consume_credentials(); if (!save("location")) { sl_reply_error(); };