Where to find the callsigns of the en route controllers? I am looking for the callsigns of ATC upper information region (UIR) controllers on a flight from Frankfurt EDDF to Seattle KSEA. According to the flight plan, the UIRs crossed are:


EDDV (Hannover)
EHAA (Amsterdam)
EGTT (London)
EGPX (Scottish)
EGGX (Shanwick)
BIRD (Reykjavik)
CZEG (Edmonton)
CZVR (Vancouver) and
KZSE (Seattle).


First, where can I find charts and information on the sectors within a UIR?

Second, does each sector have a different callsign, or are callsigns coupled to the UIR? For example, EGPX Shanwick will probably have multiple sectors, will the callsign be always Shanwick control? If they are UIR-dependent, what are the callsigns of the above-mentioned UIRs?
You can look in each country's AIP, specifically section ENR 2.1. Below is for the Netherlands:



Note the name/call-sign 'Maastricht Radar' for at or above FL 245. Maastricht UAC is...


  ... an international non-profit air navigation service provider, operated by EUROCONTROL on behalf of four States – Belgium, Germany, Luxembourg and the Netherlands.


Also from the AIP's you can find the division of the FIR's, example: