@PatriotSoul
Vonage does indeed offer an Advanced Voice API with Answering Machine Detection (AMD) capabilities that can be quite effective. While the voicemail detection settings you're referring to seem to be specific to Twilio, Vonage has its own methods for detecting voicemails.
To implement voicemail detection with Vonage, you would typically use their Voice API with the AMD feature. You can configure the AMD settings when you make an outbound call through the Vonage API. The API allows you to specify whether you want to detect if a human or an answering machine has picked up the call.
If you're finding that the costs are significantly higher due to a lack of voicemail detection with Vonage, I would recommend reviewing Vonage's documentation on AMD or reaching out to their support team for assistance in configuring AMD to suit your needs. They should be able to guide you on how to optimize your usage to potentially reduce costs.
If you need further assistance with the technical implementation or have specific questions about the Vonage API, please let me know, and I'll do my best to assist you.