Voice APIs allow customization of communication applications, including the ability to transcribe programmatic phone calls for various purposes such as transaction records and receipts. Batch transcription provides transcripts after a call is completed, while real-time transcription offers instant results during the conversation. Real-time transcription has advantages like immediate availability of speech-to-text records and the ability to reference text during ongoing calls. Choosing the right transcription method depends on specific use cases. For example, real-time transcription can benefit a recruiting agency by enabling recruiters to track conversations as they happen, while it can help a contact center by allowing managers to quickly skim active call transcripts or rely on keyword-based triggers based on the conversation.