Vertical Or Horizontal?

Today I was asked if didx.net was in a vertical or horizontal market and I was not sure of the answer. One hand we will buy and sell phone numbers through the thousands of CLEC's and independent businesses we deal with daily. That would be the vertical market. The horizontal market , on the other hand consists of the variety of customers we have, i.e. a steel fabricator or small hotel. Since I'm not sure, I''ll just look up the differences and decide for myself.

According to the Wikipedia a vertical market is " a group of similar businesses and customers which engage in trade based on specific and specialized needs." While we have a wide range of customers they do have one thing in common. They all have a softswitch in place.

On the other side is the horizontal market and here is what Wikipedia says."A horizontal market is a market which meets a given need of a wide variety of industries, rather than a specific one." I just don't see didx.net as falling into this catagory. Given we do have a wide range of customers to work with they all need that 'softswitch' to buy and sell from us so I have to go with didx.net is in a vertical market.