Key legal question
Whether the conviction violated the presumption of innocence because it relied only on the complainants' statements.
Extracted holding
No. The cantonal court could rely on corroborating factual findings, including phone-number links and identical modus operandi, so only abstract doubts remained.
Extracted reasoning
The Federal Court held that the lower court did not base guilt solely on the complainants' statements. It relied on uncontested facts binding on it under Art. 105(1) LTF, which corroborated attribution of the calls to the appellant and excluded arbitrariness in preferring the complainants' version.