In its language literature sense the term Indonesian language has been used primarily by Dutch scholars. Most scholars have avoided this expression in connection with the study of the Chamic languages of mainland ‘Southeast Asia’, despite the close relationship of this group to Malay and some other languages of western Indonesia. Although it remains a convenient label for languages of a certain type and geographic area, the term Indonesian language does not appear to refer to any definable subgroup within the Austronesia family.

Guidelines for Alphabetic pronunciation

The u in the sentence sounds more like the oo in book of Indonesian language.
Theaiinsampai is usually pronouncedayas inday, especially in Java script
The au in saudara is often pronounced 'oe' as in 'toe'.

Consonants

Consonants are pronounced very much as like English language in Indonesian language

b as in bed or bahasa
d as in dad or duduk
f as in feel or foto
g as in good or guru
l as in lap lagi selamt
m as in man malam selamat
n as in nap Natal, tahun
ng, ny,as in see siang
w as in well wayang, kawan
y as in yell yag, Yogyakart

Pronunciation of the alphabet in Indonesian language
a = ah ,b = bay, c = chay ,d = day ,e = ay, f = ef ,g = gay, h = ha, i = ee ,j = jay, k = kah = l=el ,m = em ,n = en ,o = oh ,p = pay, q = key ,r = air, s = es, t = tay, u = oo, v = fay, w = way ,x = eks, y = yay, z = zet