Call transfer to user rings whole office instead of user.

Question

I'm a new IT person for my company and I've run into a strange problem. One of our users in one of our offices has the problem that whenever he gets a call transferred to him the whole office rings instead of only his phone. He is the only one that is
having this issue everyone else can be transferred to fine. He has no call forwarding option, and I've even changed the number he has been using. I've compared his offices response group with another office that is working and I can't see anything different.
I'm pretty new to Lync so I'm not sure how to fix this, something tells me to probably an easy fix I just don't know it. 

Answer 1

When you say it says it's ringing the office, does that mean it looks like it's ringing Bob, Mary, John directly?  That's really really strange, it doesn't happen for any other user, so I wouldn't expect it to be REFER support or something else. 
It doesn't matter if you change his number.  It doesn't happen when he's directly dialed, so I wouldn't expect it to be a duplicate number or odd translation.
The next step I'd take is to run the logger on the front end and watch SIPStack, I'd also run a logger on your PSTN gateway and see if you can see anything odd happening there.  I know you're new to Lync, but I think you just got dropped in the deep
end :)
A few more questions:
How do calls reach Lync?  What sort of gateway, IP-PBX, or SIP trunk are you using?
If he's not logged in, and the call is transferred, does it still ring others or go right to his voicemail?
If that computer is shut down, and he logs into another computer, does the same issue persist?
If you completely blast his Lync account, remove it from Lync:
http://technet.microsoft.com/en-us/library/jj688008.aspx and set him up from scratch with a new number, can you get it to come back?  If that works, I'd try to give him his old number back and see if it's related to his old number, perhaps it's
something buried in your gateway or SBC.
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