Call Me
By Roger Barkan

Each line but one may be decrypted with the following key to reveal a
true mathematical equation:

DRLGMPCNTSAUOIE
0123456789+-*/=

The lone exception is PROCTORSILEX, which decrypts to 51*68*19/2=X.
Solving for X gives X = 32946. Calling this number gives a recording
of Kiran (it's his office phone) saying 4+1+6+9, which decrypts to
MARACAS.