Writing a FreeSWITCH Caller ID spoofing interface

Chris Moos

October 16, 2009

Categories: Technology
Tags: freeswitch callerid spoof

Lately I have been really interested in voice over IP, I think there is a lot of power in it. I was using Asterisk, but I’ve moved onto a much better and more powerful solution, FreeSWITCH. I was playing with it recently and decided a Caller ID spoofing interface would be fun.

When the following script is ran, it will prompt you for an access code, and if it is correct, it will let you specify a number to spoof, and a number to call. Its fun :). Also, it can send an email whenever a spoofed call is made (if you want to track your friends usage, for example).

To use the following script, put this in your dialplan: (I’ve put spoof.py in the fspy package.)

<application action="python" data="fspy.spoof"/>


import os,sys
from freeswitch import *
from datetime import datetime
from time import mktime
import httplib
import urllib
import random
import smtplib

def get_number(session,invalid,num=10):
	digits = session.getDigits(num, "#", 6000)
	if digits == '':
		if invalid == 3:
			session.speak('You have entered too many in valid entries. Goodbye.')
			session.speak('Invalid entry. Please try again.')
		return digits
def handler(session, args):
	session.set_tts_parms('cepstral', 'Allison')

	session.speak('Please enter the 4 digit access code.')
	code = get_number(session,2,num=4)
	if(code == None or code != '6969'):
		session.speak('Invalid access code, goodbye!')
	session.speak('Please enter the number you would like to spoof.')
	spoof_number = get_number(session, 0)
	session.speak('Please enter the number you would like to call.')
	dest_number = get_number(session, 0)
	session.setVariable("effective_caller_id_number", spoof_number)

	session.speak('Calling...please wait')
	server = smtplib.SMTP('smtp.mydomain.com')
	fromaddr = 'freeswitch@mydomain.com'
	toaddrs = ['someaddr@mydomain.com']
	subject = "A spoofed call was made"
	msg = ("From: %s\r\nTo: %s\r\nSubject: %s\r\n\r\n" % (fromaddr, ", ".join(toaddrs), subject))
	d = datetime.now().strftime('%A, %B %d, %Y %I:%M%p')
	msgContents = "Date: %s\nCaller ID: %s\n\nDestination Number: %s\nSpoofed Number: %s\n\n\nSincerely, \nFreeSwitch Spoofer" % (d, session.getVariable("caller_id_number"), dest_number, spoof_number)
	server.sendmail(fromaddr, toaddrs, msg+msgContents)
	session.execute('transfer', dest_number)

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