Where the channel came from is the whole test
The check has one input, and that input is origin. A channel opened from inside an application the person installed themselves, or reached by typing a known address, is attached to the company by construction. A channel found through a search result, a social network reply or a link in a message carries no such attachment, because anybody can place any of the three.
Everything else people reach for as a test is available to the other side cheaply. A logo, a colour scheme, a queue number, a case reference and a courteous greeting are all reproducible in an afternoon, and some counterfeit desks copy the genuine help centre page in full. Judging the surface measures how much the operation spent on its appearance, and a working operation spends a great deal.
Direction of contact forms the second half of the same test. Support that appears on its own, answering a complaint published minutes earlier, is an inbound contact with all the properties of one. Whoever sits on the other end chose the moment, the subject and the medium, and that choice is the entire advantage in this kind of conversation. Restarting the request from inside the account removes the advantage at no cost.