check on your SIP account configuration. the registrar URI needs to include “;transport=tcp” at the end.
# Account configuration idURI/registrarUri/Authenication
acfg = pj.AccountConfig()
acfg.idUri = "sip:" + cr.userID + "@" + cr.sipDomain
acfg.regConfig.registrarUri = "sip:" + cr.sipDomain + ";transport=tcp”
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