Thank you for that information... Sadly, our highly cautious security team only opens up ports over the VPN that are explicitly known to be in use for a specific application.
If I could find out what ports the PBX needs to use, I can work up a request to get them opened...
Make sure ports 1719 and 1720 are open in both directions.
Also watch out for any virus protection software that may impede the software.
Make sure it works from the LAN before trying it out on the VPN.
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