I have a harmony hub that can control the tv, fios, av receiver etc. It repalced a harmony remote that I had that controled everything. I can say Alex turn on the TV, Alex tell harmony pause, Alex tell harmony increase volume, Alex tell harmony skip ahead (30 second skip on dvr)
I believe is can change channels too, but have not set that up yet. The hub cost about $100 from Best Buy, and you will need a lot of set up work to define your equipment as well as the Harmony app amd the Echo Harmony skill enabled.