What’s been your biggest challenge building AI voice agents on real phone numbers?

We’ve been building AI agents that operate over real phone calls using local numbers, and one thing we keep seeing is how different voice becomes once you leave app-based or cloud-only environments.

For those working on voice AI:

• What’s been hardest for you, latency, call quality, telco integration, cost, or deployment?

• Have local numbers or regional telcos changed how you design your agents?

Curious to learn from others building in this space.