Protel Box / green box (phreaking)

protelbox.py

import time
import numpy as np
import simpleaudio as sa

# Protel Box by CyberThief
#
# This was the second to last actual phreaking box,
# the last being the Orange Box.
#
# If memory serves, this was some type of default outgoing message on a
# Panasonic answering machine. It was discovered by CyberThief that
# it returned the coin like a traditional green box but only on
# Protel payphones. The original .wav file is probably long gone
# but someone *ahem* decoded the tones and posted them to USENET.
# Also, the original Usenet post on alt.phreaking is gone because
# iirc CyberThief used to use 'x-no-archive: yes' headers. Here's what's
# left of the conversation:
#
# https://groups.google.com/g/alt.phreaking/c/6sS9GMkN72Y/m/INcPL0yr16UJ
# https://groups.google.com/g/alt.phreaking/c/yUB8x9yfMho/m/Ril3I2T6bAEJ?hl=en
#
# I've made this code longer than necessary, instead of putting the
# frequencies into some fancy list or array it's just spelled out for legibility.
# Also, I'm pretty sure only the last tone or two or three mattered.

def generate(f, seconds):
    frequency = int(f)
    t = np.linspace(0, seconds, seconds * 44100, False)
    note = np.sin(frequency * t * 2 * np.pi)
    audio = note * (2**15 - 1) / np.max(np.abs(note))
    audio = audio.astype(np.int16)
    play_obj = sa.play_buffer(audio, 1, 2, 44100)
    play_obj.wait_done()

generate(1181.5, 0.287)
generate(1,      0.127)
generate(884.8,  0.287)
generate(1484,   0.287)
generate(1116.5, 0.414)
generate(884.8,  0.414)
generate(741.5,  0.287)
generate(785,    0.287)
generate(1,      0.127)
generate(884.8,  0.414)
generate(1181.5, 0.287)
generate(1116.5, 0.414)
generate(1181.5, 0.287)
generate(589,    0.287)
generate(660,    0.414)
generate(742,    0.414)
generate(785,    0.287)
generate(993,    0.414)
generate(785,    0.287)
generate(660,    0.287)
generate(742,    0.287)
generate(1,      0.095)
generate(785,    0.414)
generate(884.8,  0.287)
generate(1116.5, 0.414)
generate(884.8,  0.287)
generate(742,    0.414)
generate(785,    0.287)
generate(1,      0.139)
generate(884.8,  0.414)
generate(993,    0.287)
generate(1327,   0.414)
generate(993,    0.287)
generate(785,    0.287)
generate(742,    0.414)
generate(1181.5, 0.568)
generate(1,      0.249)
generate(1407.5, 0.727)