ImageOne equal peer expert in their company and its operation and the other peer equal expert in other ideas, practices, systems, processes, technology, changes, ops and systems tools that can help the company work more efficiently, show more profit, turn out goods faster, whatever the company expert says they care about.

Both have the company and its interests at heart as peer equal experts and that’s the perception each must get of the other 

As the outside consulting peer equal expert so to speak, the sales person in this conversation between peer equals can ask the questions that uncover the why behind what the company peer equal expert thinks they need and what they have said is important. The Salesperson can learn about what they do now from the company’s peer equal/expert they are talking with, its impacts, bottlenecks, challenges 

The sales person can also logically then ask/learn What would the company peer equal/expert change if they could and why, even expand the conversation to a broader deeper look that sets up new thinking and sets the sales “peer equal/expert” up as a person who may have some great ideas. 
The company peer equal/expert and the sales/consulting peer/expert then can relate well with and to each other with a common connection about genuine issues, challenges, concerns. The conversation happens and the shared view between the “peer equals/experts” is then honestly assessed and solutions can be considered. 

That’s what selling is. It’s not pitch, tell, It’s a conversation between equals, each bringing different expertise to bear on uncovering issues and then how best to solve them.