Burushaski language
Burushaski is a language isolate spoken by some 40-50,000 people in northern Pakistan. While it contains many loanwords from the surrounding languages (particularly Urdu, Khowar[?], and Shina[?]), enough original vocablulary remains to set it apart from these neighbors. Attempts have been made to establish a relationship between Burushaski and Sumerian, Basque, and the Caucasian and Dravidian language families-- none of these attmepts have been accepted by professional linguists. The language of the Indus valley civilization was may have been related to Sumerian, Dravidian, Burushaski, Munda or Kalto, though until a decipherment of the Indus valley script, there can only be speculation.
Phonology
The information below was adapted from the online PDF article Burushaski: An Extraordinary Language in the Karakoram Mountains (http://www.few.vu.nl/~dick/Summaries/Languages/Burushaski.pdf).
* Liquids are glides and laterals.
Bilabial
Dental
Alveo-
palatalRetroflex
Velar
Uvular
Glottal
Stops
Voiceless
p
t
t.
k
q
Aspirated
ph
th
t.h
kh
Voiced
b
d
d.
g
Affricates
ts
tS
ts.
Fricatives
Voiceless
s
S
s.
x
h
Voiced
z
Z
z.
G
Nasals
m
n
N
Liquids*
w
l
j
Rhotic
r
Front
Central
Back
High
i
u
Mid
e
o
Low
a