Just FYI, I have on multiple occasions personally heard dispatchers patching the Brevard East BCSO TG with SLERS to talk with FWC for interoperability near the port/other waterways.
Once the situation was cleared, BCSO East dispatchers verbally announced “10-66 10-33 Clearing the patch with FWC”. You could audibly tell FWC was ProVoice digitized voice audio coming through the patch over to the analog EDACS Brevard system. It was not mixed mode FWC units operating “on” the BCSO systems TG otherwise I would’ve seen the PRV icon on my 536HP when they transmitted.
Why this sort of patching is not utilized with FHP I have no idea…for years I have heard Brevard and surrounding EDACS counties playing phone tag with FHP through dispatch centers rather than patching.