Quick Answer: The fastest way is to layer an AI voice receptionist on top of your current phone system using SIP forwarding, call routing rules, or a virtual number that preserves your existing carrier and PBX. This avoids a telecom migration while letting the AI answer, qualify, transfer, and log calls immediately.
In practice, the shortest deployment path is an overlay architecture: keep your existing business phone number, then route inbound calls to an AI receptionist through call forwarding, SIP trunk integration, or a cloud telephony bridge. This lets the AI handle first-response, intake, FAQ triage, and warm transfers without replacing your PBX, desk phones, or carrier contracts. The implementation is typically measured in hours or days, not weeks, because the main work is mapping call flows, defining escalation logic, and connecting CRM or ticketing updates.