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Route incoming calls based on time of day, caller location, or custom logic. What you’ll learn:
  • TeXML for call control
  • Time-based routing logic
  • Geographic routing

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Step 1: Create the Function

telnyx-edge new-func -l=python -n=call-router
cd call-router

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Step 2: Add Dependencies

Create requirements.txt: 
pytz>=2024.1

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Step 3: Implement Call Routing

from datetime import datetime
import pytz

class Function:
    async def handler(self, request):
        webhook = await request.json()
        caller = webhook.get("from", "")
        
        # Determine routing
        destination = self.get_destination(caller)
        
        # Generate TeXML response
        texml = f"""<?xml version="1.0" encoding="UTF-8"?>
<Response>
    <Say>Please hold while we connect your call.</Say>
    <Dial timeout="30">
        <Number>{destination}</Number>
    </Dial>
    <Say>We're sorry, no one is available. Please try again later.</Say>
    <Hangup/>
</Response>"""
        
        return {
            "status": 200,
            "headers": {"Content-Type": "application/xml"},
            "body": texml
        }
    
    def get_destination(self, caller):
        # Time-based routing
        est = pytz.timezone("America/New_York")
        now = datetime.now(est)
        hour = now.hour
        
        # Business hours: 9am-5pm EST
        if 9 <= hour < 17:
            # Route to main office
            return "+15551234567"
        else:
            # Route to after-hours support
            return "+15559876543"
        
        # Geographic routing example:
        # if caller.startswith("+44"):
        #     return "+441onal support"
        # return "+1 US support"

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Step 4: Deploy

telnyx-edge ship
Configure your Telnyx number to use this function as the TeXML webhook.