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Anybody using Checkpoint with 3CX - "ACK is not received"

Discussion in 'Windows' started by zoomzoomvince, Jul 2, 2012.

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  1. zoomzoomvince

    Jul 31, 2008
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    Hi All,

    I've been using 3CX v10 with a Zywall USG-200 now for some months and it has been rock solid and reliable. We were taken over by another company recently and the USG-200 has been replaced by a Checkpoint UTM-1 device which I no longer have control over.

    What I have noticed is that after 30 seconds calls are dropped after and ACK error.

    14:49:40.161|.\InviteADS.cpp(545)|Log2||InviteADS::eek:nAckNotReceived:[CM503021]: Call(2): ACK is not received<br>

    I then ran the firewall checker and it looks like there are translation errors.

    Looking at some other posts on this forum it seems that the firewall is obviously mis-configured and probably a PAT/NAT issue. Does anybody have any pointers on settings for a Checkpoint UTM-1 so that I can direct these guys in the right direction.
  2. StefanW

    StefanW Head of Customer Support and Training
    Staff Member 3CX Support

    Jun 2, 2009
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    Re: Anybody using Checkpoint with 3CX - "ACK is not received

    this firewall has something called: SmartDefense Categories
    This must be disabled for VoIP.
    Read here: http://www.scribd.com/doc/57472040/85/SmartDefense-Categories#outer_page_495
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
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