T7
Call flows and routing
Ladders you can defend. 3 lessons. Each lesson cites the pages that were opened, and marks the rest confirm.
A ladder you are allowed to draw
T7-R19
A ladder is a drawing of messages between named boxes.
Routing words that survived contact
T7-R20
Wikipedia's CTI article says the term covers desktop efficiency and server functions such as automatic call routing.
Transfer, conference, and what stays confirm
T7-R21
RFC 3261 includes modifying a session, not only creating one.
Sources and go deeper
Opened 2026-10. A row marked confirm has no link, because that page was not verified.
- RFC. RFC 3261, SIP last checked 2026-10
- Wikipedia. Session Initiation Protocol last checked 2026-10
- Confirm. Release-specific menus for this track. confirm. Not opened as a single checklist. last checked 2026-10