# Transfer, conference, and what stays confirm

Study notes. Not vendor documentation and not legal advice.

- RFC 3261 includes modifying a session, not only creating one.
- This session did not extract the REFER method section.
- Zoom's SDK line names scheduled callbacks, which is not the same sentence as a SIP transfer.
- Talkdesk's index names an Advanced Dialer. The dialer guide was not opened.
- Avaya transfer steps were not opened.

On the flow page, show setup and a second arrow labeled session modify, cited to the RFC 3261 abstract. Add a note: method name confirm.