Snom PA1+

How to disable TLS/SSL on Snom PA1+ via web portal?

We used to have Snom PA1 mostly installed by our iPECS Cloud customers as Paging System without any problem. But with the new Snom PA1+, we are getting issues because incoming calls are getting rejected. Snom PA1+ when I connected it from our Office network. Outbound call is working but when another extension calls the Snom PA+, it gets “Invalid”. But when I plug it from my home network, Snom PA1+ is working perfectly.  There is something in this Snom PA1+ that is special when it comes to security like SSL & TLS which we did not encounter on old Snom PA1.

Is it possible to disable TLS/SSL on this Snom PA1+?