AI Receptionist + WhatsApp summary sending issue

Questions
1

Hey,

I’m building an AI receptionist system for a hostel using the following stack:

  • Retell AI / ElevenLabs for voice agent
  • Twilio for telephony
  • N8N for automation
  • Supabase as database

The flow:

  1. Client calls the hostel’s number → forwarded to a Twilio number
  2. AI voice agent (ElevenLabs/Retell) picks up, handles the conversation, checks availability via iCal feed from their PMS (Roomadmin)
  3. After the call, N8N sends a summary to the hostel owner (who called, what they wanted, what dates etc.)

My question:
Is it possible to use a single Twilio number for both:
a) receiving regular phone calls (handled by the voice AI)
b) sending WhatsApp messages to the hostel owner’s personal WhatsApp number as post-call summaries

So the flow would be: call comes in on Twilio number → AI handles it → N8N triggers → same Twilio number sends a WhatsApp message to the owner’s private WhatsApp with the summary.

I know Twilio supports WhatsApp Business Platform, but I’m not sure if one number can handle both voice calls and outbound WhatsApp messages simultaneously without conflicts.

Is this possible? If yes, what’s the setup? If no, what’s the cleanest workaround?

Thanks

2

Yeah this totally works, voice calls and WhatsApp run on separate channels so there’s no conflict. You just need to register that same Twilio number as a WhatsApp sender through their self sign-up process (requires a Meta Business Account and template approval for outbound messages). Once that’s done n8n’s Twilio node has a “To WhatsApp” toggle that makes the sending part dead simple.

1 Like
3

Yeah this works fine, voice and WhatsApp are separate channels on Twilio so they don’t conflict at all. You just need to register that same number as a WhatsApp sender through Twilio’s self-sign-up process (requires Meta business verification). The n8n Twilio node has a “To WhatsApp” toggle built in so sending the summary is straightforward. Only gotcha is you’ll need pre-approved message templates since the owner won’t be initiating the conversation.

1 Like
4

wow thanks bro for quick help thats dope

1 Like
5

Yes @tymekjakis this is absolutely possible, but there’s an important distinction to understand about how Twilio handles phone numbers vs WhatsApp.

You cannot use the exact same number for both voice calls and WhatsApp. However, you can use two separate Twilio numbers (one for voice, one for WhatsApp) and make the setup work seamlessly.