Listed below are instructions for calling to/from the CIS (Commonwealth of Independent States, also known as the former Soviet Union) and the United States.
From a home phone in the US dial:
international code – country code – city code – local number.
For example, to call Dushanbe, Tajikistan:
011 – 992 – 372 – XX-XX-XX
From a phone in Tajikistan dial:
intercity code – area code – local number.
For example to call Oregon from Dushanbe:
8 – 451 – XXX-XXXX
This information was obtained from: Travel Tajikistan