<table cellspacing='0' cellpadding='0' border='0' ><tr><td valign='top' style='font: inherit;'>Hi All,<br><br>I have 2 asterisk servers connecting to a mysql cluster. I'm using realtime on both asterisk. users register via domain, i have that domain on round-robin. users can register and sometimes can call each other, but sometimes even if an extension is register and i tried calling it, i got this on the the cli:<br><br>[Jul 23 12:44:52] WARNING[32259]: app_dial.c:1183 dial_exec_full: Unable to create channel of type 'SIP' (cause 3 - No route to destination)<br>[Jul 23 12:44:52] == Everyone is busy/congested at this time (1:0/0/1)<br><br>but xlite or ip phone shows the extension is registered. but asterisk says it's busy. phones are behind NAT and using stun server. sip keep-alive is enabled onxlite or ip phone. but it's just very inconsistent. i don't know where to look at to fix this. any idea?<br><br>nhadie<br></td></tr></table><br>