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.
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. sip debug from asterisk: https://pastebin.com/Mmz9JsAP tcpdump from pbx: https://pastebin.com/jRT9QJwq sip.conf: [121] type=friend ;qualify=yes ;qualifyfreq=300 host=dynamic context=extensions secret=MySecret nat=no callerid="MBR" <121> can anyone give me clues to troubleshoot?
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