Hello,
we have 3CX PBX server on internal network and enabled VoIP (Network Protection-->VoIP-->SIP) on our UTM v9 (9.409-9) to allow SIP comunication with our VoIP provider: all seem works fine but sometimes a phone call is established without audio or a call is broken unexpectly. We don't have intrusion prevention enabled on phone networks interface and UTM logs don't show dropped or rejected packet.
Could you confirm that SIP ALG is under Web Protection-->Application Control? We have Network Visibility disabled.
Any help will be welcome to investigate the problems, thanks.
Kind regards,
Fabio
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