A main line blockage takes the whole house out at once. Every fixture backs up, the lowest drain in the building takes the overflow, and nothing works until the line is cleared. That is a same-day call.
The distinguishing sign is that it is not one fixture. A single slow sink is a branch problem. Toilets bubbling when the washing machine drains, or a basement floor drain overflowing when an upstairs toilet is flushed, means the main.
We clear first so the house is usable, then camera the line to find out why it blocked. On an older Wichita property the answer is usually roots at a clay joint.
Technician insight
If the basement floor drain overflows when you run water upstairs, stop using water and call. Every flush after that goes onto the basement floor.