Hi there - I have setup a new Sophos XG105w at a client and I am having issues with calls dialing out over their 3CX system. The 3cx firewall checker passes.
In some cases the call wont even try and dial out when dialed. 'Pls Hang Up' or 'Not found' are noted on the phone displays and no connection. Its like the call isn't even reaching the PBX. The odd call goes through successfully. Incoming calls are fine.
Initially when we set it up - the SIP helper was disabled by us as we read that in the Sophos KB however we were getting no audio on the calls - so we enabled it again and the audio came back. Sophos support said the sip helper must not be enabled on the VOIP provider side and so we had to enabled it on the XG firewall.
I have one rule setup with all the 3CX ports forwarded from anywhere (for the moment) on the WAN to the internal IP of the PBX that sits behind the firewall.
I have another rule setup to allow the PBX to talk out on the WAN to anything over any port.
Some calls ring through - others don't. Looked at the packet capture (diagnostics menu) on the XG but can't see where issue is. Did a drop-packet-capture command as well on the console with no results.
If someone has a 3CX behind a Sophos XG can you please share the rules and relevant settings you have in place for it to work. At my wits end here trying to figure it out.
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