We all hate calling customer service and listening to the 'Press 1 for billing, 2 for technical support' announcement for minutes. But what if the person who answered the phone was an AI assistant who directly asked, 'Hello Mrs. Ayşe, are you calling about your last invoice?' At DoWaba, we achieved exactly this using SIP Trunk technology. Let's explain how we built this architecture without getting into boring technical details.

What is a SIP Trunk? (In its Simplest Form)

In the past, company phone exchanges consisted of boxes connected to massive cables. SIP Trunk (Session Initiation Protocol Trunking) carries phone calls over the internet instead of traditional copper wires. This means when a customer calls your company's official number, the call comes directly to our servers as internet data packets.

Connecting the Call to AI

When a customer calls, the following stages occur in our system:

  1. Call Reception: The customer calls your company number. Via SIP Trunk, this call is instantly routed to our intelligent Voice Bridge.
  2. Speech-to-Text: The customer's sentence, 'I want to book a haircut appointment for tomorrow', is transcribed into text in milliseconds.
  3. AI Steps In: A powerful language model (like Gemini Live) understands this request, checks the calendar, and generates a response text like, 'Sure, is 14:00 tomorrow suitable?'
  4. Text-to-Speech: This response is read back to the customer with a highly natural, emotive, and native-sounding voice.

Why is Latency Crucial?

Although the four steps above sound like they take a long time, in the DoWaba architecture, they are all completed in approximately 800 milliseconds. So, the moment the customer finishes speaking, our assistant starts replying. There are no robotic silences or 'Please wait' warnings.

What Does This System Provide to Businesses?

  • Phones That Are Never Busy: A single AI assistant can talk to 300 different customers simultaneously. Hold music becomes history.
  • 24/7 Uninterrupted Support: A patient calling at 3 AM can book an appointment at your clinic for the morning.
  • Conversation Summaries: When the call ends, a transcribed text of the conversation and a summary like 'Customer booked an appointment' instantly drops into your panel.

In short, when we combine the power of SIP Trunk and artificial intelligence, companies get rid of massive call center costs while customers enjoy getting service without being put on hold.