When we install etherSPLIT, will we have any issues regarding Lifeline/911 requirements with the phone circuit?
None at all (as long as you aren’t the exchange carrier or your PBX system resolves those issues). Since etherSPLIT is a passive device, requiring no external power, the issue of losing phone service is non-existent. The actual phone line service passes through the splitter device and does not effect actual phone operation.