As a business analyst, when you were asked to gather requirements of a new system, this product has an excel template that helps a business analyst with the list of questions to ask to elicit the following high level non-functional requirements (NFRs) of a new system:
Usability requirements
Reliability requirements
Performance requirements
Supportability requirements
Implementation requirements
Interface requirements
Physical requirements
Safety and Security Requirements
You can send this template to your stakeholders and ask them to provide answers without the need to have a voice call with them.
Once you receive the answers, you can document them in your requirements document.