I am sure that I am forgeting something but I don't know what.
How BE3K connect with SPA?
Should I configurate anything else before add PSTN connection into BE3K GUI?
I suppose that the BE3K need something to connect with SPA, but when I change a value into BE3k that should reset the SPA, SPA never restart, then I suppose that connection between BE3K and SPA doesn't work.
I have checked that I have ping with both devices.