There are only so many ways a drain fails, and each failure has one tool that suits it and two or three that do not. Every page below says which, including the cases where the honest answer is that we are not what you need.

A call almost always starts at the first one. Something is backing up, and the first question is whether one fixture is affected or the whole house — which decides between a branch job and a main line job, and those are not the same size of problem or the same size of bill.
If the line is stopped, it gets opened. Cabling is what opens it, and it is the right tool for roots and hard obstructions. If the line has been opened before, that is when the camera earns its place: not as a routine extra, but because a second or third visit means something in that pipe is catching in the same spot, and nobody can tell you what without looking.
What the camera finds decides the rest. Grease on the wall is a jetting job. An open joint or a collapse is a repair, at a footage and a depth so it can be dug to rather than searched for. A sag is a grade problem and nothing that goes down the pipe will fix it. And if the house has no cleanout, that is worth solving on its own, because it is the thing quietly adding to every bill.
Describe what it is doing and the office will tell you what it is likely to be and what the visit involves. Nothing is priced over the phone on a line nobody has seen.
Scripted demonstration. It cannot book, hold or confirm a time, and it will not quote a price.