Can an AI Voice Agent Handle Inbound and Outbound Calls on the Same Phone Number? (2026)

Fragmented Number Anti-Pattern vs Unified Two-Way Voice AI:

Legacy Telemarketing Setup (High Friction):
- Outbound Call dials from +1 (555) 019-1111 (Disposable dialer pool).
- Prospect misses call, dials back: "The number you have dialed is not in service."
- Prospect feels spammed, blocks number, and leaves negative review.

Unified Two-Way Line (Auto Interview AI):
- Outbound Call dials from +1 (555) 019-8822 (Verified company brand line).
- Prospect dials back 2 hours later:
  "Hello Sarah! Thanks for calling Acme back. I was calling earlier about your solar consultation."
- Lead converts smoothly into a booked appointment on the first ring.

The 4-Step Inbound Callback Resolution Workflow:

Inbound SIP INVITE Received from Caller: +1 (555) 019-2831
                              │
                              ▼
┌────────────────────────────────────────────────────────────────────────┐
│ 1. Caller ID (ANI) Database Query (<20ms)                              │
│    - Checks active CRM leads and recent outbound campaign logs         │
└────────────────────────────────────────────────────────────────────────┘
                              │
               ┌──────────────┴──────────────┐
               ▼                             ▼
Case A: Existing Lead Recognized        Case B: Brand New Caller
- Lead Name: Sarah Jenkins              - Lead: Unknown / Unregistered
- Prior Note: Sent quote $14,000        - Intent: Inbound customer inquiry
               │                             │
               ▼                             ▼
[AI Speaks in <180ms]:                  [AI Speaks in <180ms]:
"Hi Sarah! Thanks for calling us back   "Thank you for calling Acme!
regarding your roofing estimate."       How can I help you today?"

Prompt State Engine:

State 1: Direction = OUTBOUND
- Goal: Qualify interest, overcome price objections, book calendar demo.
- Cadence: Proactive, energetic, concise value propositions.
- Opening: "Hi Michael, this is Alex with Acme Tech, calling about your trial account..."

State 2: Direction = INBOUND
- Goal: Answer technical questions, triage support tickets, resolve billing issues.
- Cadence: Receptive, patient, empathetic listening.
- Opening: "Thank you for calling Acme Tech support! My name is Alex, how can I assist you?"

import asyncio
import time

class TwoWayTelephonyRouter:
    """
    Directs incoming and outgoing calls on a single telephone line,
    contextually linking callbacks to prior outbound conversations.
    """
    def __init__(self):
        # In-memory CRM database
        self.crm_records = {
            "+15550192831": {
                "name": "Sarah Jenkins",
                "campaign": "Commercial Solar Q3",
                "last_called": "Today at 2:15 PM",
                "status": "Awaiting Callback"
            }
        }

    async def handle_call_connection(self, caller_number: str, direction: str) -> dict:
        """Determines persona and opening greeting in <15ms."""
        await asyncio.sleep(0.015)
        
        if direction == "outbound":
            return {
                "persona": "SALES_SDR",
                "greeting": f"Hi, this is Alex with Apex Solar calling for {self.crm_records.get(caller_number, {}).get('name', 'there')}."
            }
        else:
            # Inbound call received
            customer = self.crm_records.get(caller_number)
            if customer:
                return {
                    "persona": "CONSULTATIVE_CLOSER",
                    "greeting": f"Hi {customer['name']}! Thank you for calling Apex Solar back. I reached out earlier regarding your solar estimate."
                }
            else:
                return {
                    "persona": "INBOUND_RECEPTIONIST",
                    "greeting": "Thank you for calling Apex Solar! My name is Alex, how can I assist you today?"
                }

if __name__ == "__main__":
    router = TwoWayTelephonyRouter()
    
    async def simulate_calls():
        # Scenario 1: Prospect dials back after missing call
        res = await router.handle_call_connection("+15550192831", direction="inbound")
        print("=== Inbound Callback Recognized ===")
        print(f"Assigned Persona: {res['persona']}")
        print(f"Spoken Greeting: '{res['greeting']}'")

    asyncio.run(simulate_calls())