Communications systems require an “intersystem bonding conductor” that allows them to be bonded to the grounding electrode system (GES). Your GES must contain a bonding termination for this purpose [as per NEC Sec. 250.94], and it must meet the six requirements enumerated in 250.94. You don’t have to add this termination (if missing) to existing buildings or structures, but you still have to connect the intersystem bonding and the GES.
Bonding, Part 3
The goal is to prevent having two systems that are at different potentials from each other.