I am running FreePBX and using flowroute as the SIP provider. I am unable to receive calls. We have a Fortigate firewall and I have already disabled SIP ALG. When I place a call to the phone system all I get is a busy signal.
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hi, when we there is no audio or calls dropping in Asterisk that is almost always because of NAT or other net similar network issues. kindly let me know a little more about your system so i can better diagnose the is Plus