Phone
From Applied Optics Wiki
Internal to External phone numbers
University telephone extension numbers Direct dial prefix required
13000 - 16999 0115 95 xxxxx
24600 - 24999 01332 7 xxxxx
30000 - 32999 0115 82 xxxxx
48120 - 48189 01522 8 xxxxx
65600 - 65660 01623 4 xxxxx
66000 - 68999 0115 84 xxxxx
75050 - 75089 01205 8 xxxxx
83000 - 83099 0115 82 xxxxx
84000 - 87999 0115 74 xxxxx
89050 - 89069 01476 5 xxxxx
https://www.nottingham.ac.uk/dts/communications/phones/useful-numbers-and-codes.aspx