from flask import Flask, request
app = Flask(__name__)

@app.route("/", methods=["GET", "POST"]) 
def say(): 
  #check call direction (from the response sent to your callback URL
  direction = request.values.get("direction", None) 
  # send a reject response if the direction is Inbound 
  response = '' 
  if (direction == "Inbound"): 
    response = '<?xml version="1.0"?>' 
    response += '<Response>' 
    response += '<Reject/>' 
    response += '</Response>' 
  # else do what you want with outbound calls(call logic here) eg: say  something, dial a sip line etc. 
  else: 
    response = '<?xml version="1.0"?>' 
    response += '<Response>' response += '<Say> Hello, I will reject your incoming call but will call you back! </Say>' 
    response += '</Response>' 
  return response