The Australian government's controversial metadata retention scheme could include upload and download volumes and financial information.
But destination IP addresses and URLs, which could be used to track people's web browsing habits, will not be retained.
That's according to a wishlist drawn up by the Attorney-General's Department as part of confidential preliminary discussions with telcos on the proposed measures.
The wishlist, obtained by The Australian newspaper, is the best articulation of the type of data that telcos would be required to collect and store for two years for warrantless access by government agencies.
It reportedly says that telcos should retain records that would identify the names and addresses of account holders, as well as data to identify the source of a communication and the device used.
Information about when and where communications begin and end is also retained, as is information that would reveal how much data users are uploading and downloading.
The paper also suggests that the scheme should be able to capture supplementary information such as birth dates, and financial and billing records, the newspaper reported.
The proposal got off to a rocky start earlier this month, when Prime Minister Tony Abbott and Attorney-General George Brandis struggled to explain the kinds of information that would and would not be retained.
That prompted ASIO and the Australian Federal Police to publicly clarify the types of data that would likely be included.
It remains unclear whether data kept by social media sites such as Facebook and Twitter will be included in the scheme.