Of course they do not make the router.
When I (or just about anyone else) use the words "Savvis router" it is in the context that it is a router, in use by Savvis, within thier network, to route IP traffic. And used it in the oldest and most simplistic analogy which compares traveling on the internet to driving on a highway.
" In my case it is the hop from seatle to Denver that seems to mess up the most. It is quite likely that you don't go through that same router to arrive at the co location datacenter. "
Exactamundo. However many people do not understand that and they will ignorantly insist that a company at the destination point (in this case HTC) take full responsibility for all thier connection problems.
The fact is HTC cannot possibly fix IP problems in an ISP's network between, for example, Seattle and Denver.