that difficult question because each service has a maxmium call / usage (for made simple). 11l Creator account accept 5 call simultanous / VAPI 10. But how did you made if you have 2 call back in the same time 😅 The cAPS enter on the game. VAPI is 10$ per caps / Twilio arround 10$ ... So i suggest to pass 5 call at the same time max ,even if you paid 🙂