Hey everyone! I'm building a backend-only call routing system using Twilio and FastAPI and I wanted to double-check my approach. Here's what I'm working on:
- When customers call a Twilio phone number, my backend will determine which agent should handle the call.
- Returning customers are routed to their previous agents.
- There's no frontend, dialer, or use of Twilio Client yet; it's just calls to real phones.
Here's how my current flow works:
1. Customer calls the Twilio number.
2. Twilio hits my /webhooks/voice/inbound endpoint.
3. My backend validates the X-Twilio-Signature, reads the caller's phone number, checks the database for existing customers, and assigns an agent (whether new or returning).
4. The backend responds with TwiML to dial the agent's real phone number.
5. Any call status updates are sent to /webhooks/voice/status for analytics.
I have a few concerns:
- Is it okay to not create agents within Twilio and just dial their phone numbers directly?
- Is this a common approach for an MVP before transitioning to Twilio Client or TaskRouter?
- Are there any pitfalls I should look out for?
In the future, I plan to switch to using Twilio Client (softphones) by returning instead of phone numbers. I'd love to get your thoughts and experiences if you've done something similar!
2 Answers
I've done several integrations with Twilio, and here are some important points:
1. **Dialing Directly**: You can absolutely dial agent phone numbers directly with TwiML without creating agents in Twilio. This clientless routing is common and works well with your backend logic.
2. **Database Design**: Make sure your setup efficiently maps the caller’s phone number to their last handling agent, using a good database schema to avoid slow queries.
3. **Rate Limits**: Be aware of Twilio's API rate limits; managing these is crucial to keep your performance optimal.
4. **Error Management**: Implement error handling for any failed Twilio calls to ensure your call tracking is reliable.
5. **Scalability**: Test how your system performs as the call volume grows, especially if it’s going to handle a lot of traffic.
6. **Webhook Robustness**: Ensure your /webhooks/voice/status endpoint can handle real-time updates efficiently to avoid loading your database unduly.
I’m not an expert on the tools you’re using, but here are a few things to consider:
1. Does Twilio have guidelines for using their services? Are you following those?
2. Most importantly, does your code work as intended?
3. Have you received any warnings or limitations from Twilio for improper use?
4. Does the billing from Twilio seem reasonable? You don’t want those costs to spiral!
5. Are your customers satisfied, or are they having issues with the service?
If you can answer ‘yes’ to questions 1 and 2, and ‘no’ to 3–5, then it sounds like you’re on the right track!
That’s solid advice! I haven’t implemented everything yet, but I definitely want to make sure I’m guided properly before I dive in. And yes, Twilio does provide an SDK to work with our backend.