
Multilingual Voicemail and Answering Machine Detection via Pretrained Audio Embeddings and Gradient Boosting Machines
The method replaces proprietary answering machine detection systems and computationally expensive real-time models (including ASR-plus-LLM pipelines) with frozen pretrained audio embeddings feeding a gradient boosting classifier. Cost is low: no GPU or fine-tuning is required for inference, training reduces to fitting a GBM on extracted embeddings, and the authors release a 500+ recording, 7-language dataset (OpenAMD) for replication. What can fail: the dataset is small for a production telephony system, per-language and per-gender performance differences were found statistically significant, and robustness degrades under additive noise and packet loss typical of real carrier networks.







































