The two categories of answering service
Generic answering services (Davinci Virtual, Voice Nation, AnswerConnect) handle calls across many industries with minimal industry-specific training. They are inexpensive and broadly available. They are also typically unsuitable for any law firm with high-value matters, because untrained intake staff cannot effectively triage matter type, run conflict checks, or qualify the caller before booking the appointment.
Legal-specific intake services (Smith.ai, Ruby Receptionists with legal-specialised teams, PATLive's legal vertical, Back Office Betties) employ intake staff trained on legal matter types, conflict-check workflows, and intake-form completion. They cost more per call but typically convert dramatically better.