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In non-final positions, /u/ /o/, /i/, and /e/ are [ʊ] [ɔ], [ɪ], and [ɛ], respectively. [ə] appears only in unstressed syllables; when it is followed by /w/ it is rounded: .
Between vowels, /b/ and /ɡ/ lenite to the fricatives [β] and [ɣ], respectively. /s/ is realized as an affricate, [ts], word-initially. /h/ is velar, [x], after /a/ and /o/. Word-finally, voiceless stops are usually unreleased.
Phonotactics
The consonant /ŋ/ only occurs finally. Bilabial and velar consonants may be followed by /w/ when initial, but otherwise consonant clusters only occur over syllable boundaries, with the exception of the unusual word /məmt/ ('snake').
Foley, William A. (2018). "The Languages of the Sepik-Ramu Basin and Environs". In Palmer, Bill (ed.). The Languages and Linguistics of the New Guinea Area: A Comprehensive Guide. The World of Linguistics. Vol. 4. Berlin: De Gruyter Mouton. pp. 197–432. ISBN978-3-11-028642-7.