The headquarters of National Institute of Telecommunications is located in Miedzeszyn, on the edge of Mazovia Protected Lansdcape Park.

National Institute of Telecommunications
Szachowa Str. 1
04-894 Warsaw
Phone: (+48 22) 51 28 100
Fax: (+48 22) 51 28 625
E-mail: info@itl.waw.pl
GSP: LAT: 52° 10' 21,7'' N; LON: 21° 11' 41,4'' E

Gdańsk Branch
Jaśkowa Dolina Str. 15
80-252 Gdańsk
Phone: (+48 58) 341 71 21
Phone: (+48 58) 341 80 91
Fax: (+48 58) 341 71 12
E-mail: R.Niski@itl.waw.pl
GPS: LAT: 54° 22,470' N; LON: 18° 36,321' E

Wrocław Branch
Swojczycka Str. 38
51-501 Wrocław
Phone: (+48 71) 36 99 800 (803)
Phone: (+48 71) 372 88 68
Fax: (+48 71) 372 88 78
E-mail: wroclaw@il.wroc.pl
GPS: LAT: 51° 06'54,3" N; LON: 17° 06'52,6" E