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SIP voice call issue "no audio"

Fabio Ermotti

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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  • 0

    Hi Fabio,

    SIP can be blocked via Application control as we have a signature under Web > App Control. If you do not capture any drop logs anywhere I suspect that the disconnection occurs from the UTM side. When a call get's disconnected did you check the WAN link usage in logging and reporting> Network usage; is it fully utilized. Also check that Anti-DoS is not configured.

    Thanks

  • 0 in reply to sachingurung

    Hi Sachin,

    our Application control section is Disabled and IPS is not active on SIP network interface. The problem that happens more often is the call without audio: checking the SIP log session all seems OK but we need to investigate if there is some particular reason for the firewall to rejected or drop audio packet after SIP session is active.

    Thanks a lot for the moment!

    Fabio

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  • 0 in reply to sachingurung

    Hi Sachin,

    our Application control section is Disabled and IPS is not active on SIP network interface. The problem that happens more often is the call without audio: checking the SIP log session all seems OK but we need to investigate if there is some particular reason for the firewall to rejected or drop audio packet after SIP session is active.

    Thanks a lot for the moment!

    Fabio

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