I understand you have a new cable box, which is not in our database. We recommend customers in this same situation to choose a cable box that is similar to theirs. If you are not able to get one that works for you, an enhancement request would be the next step. Below is a helpful link:
Sling Media Support!
The problem is that I can get a picture and sound. Everything is great, but
when the remote device (iPhone) sends the signal to the unit to change
channels, it won't change. It blinks and stays on the channel it's on.
IR is hooked up. But it won't change channels.
In a message dated 12/5/2016 5:42:03 P.M. Central Standard Time,
Set up help
reply from SlingSupportMagdalena
(https://community.slingbox.com/people/SlingSupportMagdalena?et=watches.email.thread) in TV Source Set Up - _View
the full discussion_