Problem with Yealink T28P phone office network

[GG2good]

Alright, I'm pretty lost here and I'll try to explain this as clear as I can.

I have a small office environment with seven phones, all Yealink Enterprise IP Phone SIP-T28P. One of them is the reception phone, lets call it X. The other ones are worker phones, let's call them A, B, C, etc., accordingly. Let me point out, that everything used to be okay, then the office was moved and the problem started.

The problem: the reception phone is the central phone. Seems like it's become, you could say, "too central". Whenever any of the worker phones call eachother, say, A calls B, for B it appears X is calling. Even internal calls go trough X. On phone B it should appear that A is calling.

What might be the problem? If I haven't expressed my problem clearly enough, ask anything and I'll answer right away.