 Extract information from invoices and credit notes: Azure Document Intelligence in Foundry Tools

 Identify discussion topics in customer service call recordings: Azure AI Search

 Detect customer sentiment and opinions: Azure AI Search

To minimize development time, you should select services that provide prebuilt extraction and enrichment rather than building custom models.

For invoices and credit notes , the best fit is Azure Document Intelligence because it is purpose-built for intelligent document processing and includes prebuilt models (such as invoice-style extraction) that return structured fields (invoice number, vendor, totals, dates, line items). This directly satisfies “extract information” from financial documents without custom ML training.

For customer service call recordings , the raw input is audio, but the task is to identify “discussion topics,” which is an information discovery and text-enrichment problem once the calls are transcribed. Azure AI Search is the correct recommendation because it can index large collections of content and apply built-in AI enrichment (for example, key phrase extraction and entity extraction) to help derive and query “topics” across many records.

For sentiment and opinions , Azure AI Search is again the best choice in this constrained list because it can run built-in enrichment skills over ingested text (such as transcripts or notes) to annotate content with sentiment-related metadata and then make that enriched data searchable and filterable at scale. This approach delivers fast time-to-value: ingest → enrich → index → query, without standing up a custom training pipeline.