Again, the legal obligation is already on telecommunications service providers. The legal obligation would be on their ability to contract and procure, and “telecommunications service provider” is already much narrower than “person”.
The question is, who can they contract with? If you substitute “person” for “telecommunications service provider”, you can only restrict their ability to contract with other telecom service providers, but that's not the issue. The issue is that they're contracting with their supply chain, so that's why it's TSPs contracting with “persons”.
When we're talking about something as technical and complex as the goods and services that Bell uses to run its network, there's not an issue of individual rights. We're talking about contracting between corporations.