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I have a network that spans 8 physical locations over a VPN, Sites 2, 3, 4, 5, 6 , 7 and 8 all have netgear firewalls but site 1 (head office) I have the sophos XG firewal. All locations have a panasonic digital hybrid phone system.
Previously site 1 also had a netgear firewall, I switched it out for various other reasons but my site to site VOIP over the VPN worked flawlessly. Calls to and from 2 to 3, or 2 to 5, 5 to 6 ect..anything that doesn't originate or terminate at site 1 still work perfectly, but on or about when I switched site 1 to the sophos firewall I started having call quality issues with any calls that do originate or terminate at site 1. (I am assuming dropped packages, the sounds cuts out momentarily, there's a hollow sound and i lose a word or two from the audio every few minutes), sometimes it's worse than others but at pretty much all times it makes it near impossible to carry on a conversation)
The ISP claims they have run every possible test and there is no packet loss or instability with my WAN. Could this be the firewalls fault? what settings could I adjust to attempt to rectify this?
I appreciate your patience and detailed responses, i'm quite unfamiliar with the sophos product.
Hi Luc Bouillon You may use packet capture utility to monitor the traffic- https://community.sophos.com/kb/en-us/127647Moreover, VoIP articles would be helpfulhttps://community.sophos.com/kb/en-us/127785https://community.sophos.com/kb/en-us/123523