It depends from company to company, but yeah, Cable and Satellite companies usually outsource the infrastructure and management to third party VOD companies. It’s a very complex chain of technology, hence why if there’s a problem it can sometimes be hard to fix - especially with larger cable companies where there’s a lot of regional centers for this sort of stuff.
The cable/sat companies do have far greater control in resolving these issues though, which is why it’s very important to let them know (and make sure they understand the issues at play). Sometimes they brush off content providers and just tell them everything is fine. Customers as a whole have a lot greater influence in resolving issues.