We have a VoiceGuide system on a fixed IP address connecting to an Asterisk service. The asterisk side is setup as “host=2.3.4.5” (Fixed IP 2.3.4.5 – not the real one of course). Whenever we start dialing, the Asterisk system answers with :
[2018-03-27 09:20:42] ERROR[25077]: chan_sip.c:17760...