Hey guys, to the people who actually sold AI phone callers, receptionists, agents... Is it still a good idea to learn how to make those agents for someone new in the AI space, or is the market already going somewhere else, and AI phone agents are just an old story?

Hey guys, has any of you ever made or tried to make a AI phone caller that would reserve tables for a restaurant? If yes, how did you implement it? How do you connect the agent to the software the restaurant uses to reserve the tables? with API?