<html><head></head><body><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div> <div><div><div><div><div>sometime during the past few upgrades on asterisk 13, my Cisco 7965G phones are sporadically not able to make calls. after a few seconds, they just play a fast-busy tone. I tried upgrading the 7965G OS from their original (working for years) 9.4.2SR1 to 9.4.2SR3 and the behavior did not change.<br><div><br>they are talking via chan_sip on asterisk 13.19.0. I cannot determine the sporadic part, sometimes the call goes through fine with no configuration changes or restarts/reboots on either end.<br></div></div><br></div></div>sip debug from asterisk:<br></div><a href="https://pastebin.com/Mmz9JsAP" rel="nofollow" target="_blank">https://pastebin.com/Mmz9JsAP</a></div><div><div><br><div>tcpdump from pbx:<br></div></div><a href="https://pastebin.com/jRT9QJwq" rel="nofollow" target="_blank" class="">https://pastebin.com/jRT9QJwq</a></div><div><br><div>sip.conf:<br><span>[121]<br>type=friend<br>;qualify=yes<br>;qualifyfreq=300<br>host=dynamic<br>context=extensions<br>secret=MySecret<br>nat=no<br>callerid="MBR" <121></span><br></div></div><div><br><div><div><br><div>can anyone give me clues to troubleshoot?<br><br></div></div></div></div><div><br></div></div><div><br></div><div><br></div><div><br></div></div></body></html>