Think a lot of people do not understand what a VPN is or for.Yes.
Just built a pfSense Firewall/ router and we have two EE 'Singnal Box' for our mobile phone signal and I had to open some ports on pfSense to let the EE box's VPN to connect.
Amazing you've still got them, as others have stopped providing now Wifi calling exists. However those femto cells are often hard to get through firewalls, as they create their own IPsec VPN, which is not NAT friendly, and the telco doesn't want to tell you how it works... We had end of trouble with the Vodafone equivalent, gave up and ended up putting them on a BT ADSL line in the office.
20 years of broadband connectivity since 1999 trial - Live BQM



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jchamier