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Go ahead Paypal! Just try and get past my voice/dtmf Captcha system on my Asterisk PBX with your robocaller. I whitelist friends and family so they don't have

by hwstar 11y ago

Go ahead Paypal! Just try and get past my voice/dtmf Captcha system on my Asterisk PBX with your robocaller. I whitelist friends and family so they don't have to go through the Captcha if they call. So far, I've received no friends and family robocalls, but receiving one eventually would not be surprising.

fapjacks 11y ago
This is awesome. I am pretty familiar with Asterisk and can think of a couple ways to do this, but I would love to see a blog post or something detailing how you accomplished this.
- rosser 11y ago
  Seconded! Please take moment to write up how you accomplished this wizardry, for the benefit of mankind. (Or at least the Asterisk-using subset thereof...)
  - hwstar 11y ago
    1. The following macro does the captcha: [macro-captcha] exten => s,1,Answer exten => s,n(retry),Wait(2); exten => s,n,Set(pin3=${RAND(100,999)}); exten => s,n,Playback(reallivehuman); exten => s,n,Wait(1); exten => s,n,SayDigits(${pin3}); exten => s,n,Read(pinent,,4) exten => s,n,GotoIf($["${pin3}" = "${pinent}"]?ok:retry) exten => s,n(ok),Playback(queue-thankyou); 2. The whitelist jumps around the Captcha macro in the incoming context: exten => 6199111111,n,GotoIf($["${CALLERID(num)}" = "2024561414"]?whitelist) exten => 6199111111,n,Macro(captcha); * Do captcha exten => 6199111111,n(whitelist),Goto(inbound-calls-main,s,1); This also buys me peace and quiet during the few days leading up to election day. (Political robocalls are what caused me to implement it).
    - fapjacks 11y ago
      Perfect! Your hard work has subsequently been stolen and implemented elsewhere. Thank you!
meesterdude 11y ago
ah yes, asterisk <3 many fond memories of running a PBX in my basement and two cisco IP phones and a crappy VOIP trunk. I remember beefing up the wakeup reminder functionality too (that might have been asterisk@home specific; before they went and became jerks) so tempting to set that up again!
Someone1234 11y ago
That sounds like a fun weekend project. Any good Asterisk guides or just use the official documentation? I wonder if a Raspberry Pi could handle it.
- trebor 11y ago
  The old Raspberry Pi was able to handle 1-2 simultaneous calls with no signs of trouble. We were able to run a 3 way call between 2 lines and a cell user without problems. The newer Pi should be capable of handling ~3-5 calls, assuming similar scaling.
  - meesterdude 11y ago
    I was handling 3 calls on a PIII and 256MB of ram. the Pi, especially the second edition, should handle asterisk fairly well; it actually makes an ideal PBX server!
stox 11y ago
Welcome to the voice menu from Hell. We used to do that with AT&T Voice Power cards back in the day.
MichaelGG 11y ago
That only helps their stats. Robo dialing wants to avoid less than 6 second calls, and generally keep their average answer ratio and call duration up. The best bet is to answer and hangup within a few seconds

by hwstar 11y ago

fapjacks 11y ago

This is awesome. I am pretty familiar with Asterisk and can think of a couple ways to do this, but I would love to see a blog post or something detailing how you accomplished this.

rosser 11y ago
Seconded! Please take moment to write up how you accomplished this wizardry, for the benefit of mankind. (Or at least the Asterisk-using subset thereof...)
- hwstar 11y ago
  1. The following macro does the captcha: [macro-captcha] exten => s,1,Answer exten => s,n(retry),Wait(2); exten => s,n,Set(pin3=${RAND(100,999)}); exten => s,n,Playback(reallivehuman); exten => s,n,Wait(1); exten => s,n,SayDigits(${pin3}); exten => s,n,Read(pinent,,4) exten => s,n,GotoIf($["${pin3}" = "${pinent}"]?ok:retry) exten => s,n(ok),Playback(queue-thankyou); 2. The whitelist jumps around the Captcha macro in the incoming context: exten => 6199111111,n,GotoIf($["${CALLERID(num)}" = "2024561414"]?whitelist) exten => 6199111111,n,Macro(captcha); * Do captcha exten => 6199111111,n(whitelist),Goto(inbound-calls-main,s,1); This also buys me peace and quiet during the few days leading up to election day. (Political robocalls are what caused me to implement it).
  - fapjacks 11y ago
    Perfect! Your hard work has subsequently been stolen and implemented elsewhere. Thank you!

meesterdude 11y ago

ah yes, asterisk <3 many fond memories of running a PBX in my basement and two cisco IP phones and a crappy VOIP trunk. I remember beefing up the wakeup reminder functionality too (that might have been asterisk@home specific; before they went and became jerks) so tempting to set that up again!

Someone1234 11y ago

That sounds like a fun weekend project. Any good Asterisk guides or just use the official documentation? I wonder if a Raspberry Pi could handle it.

trebor 11y ago
The old Raspberry Pi was able to handle 1-2 simultaneous calls with no signs of trouble. We were able to run a 3 way call between 2 lines and a cell user without problems. The newer Pi should be capable of handling ~3-5 calls, assuming similar scaling.
- meesterdude 11y ago
  I was handling 3 calls on a PIII and 256MB of ram. the Pi, especially the second edition, should handle asterisk fairly well; it actually makes an ideal PBX server!

stox 11y ago

Welcome to the voice menu from Hell. We used to do that with AT&T Voice Power cards back in the day.

MichaelGG 11y ago

That only helps their stats. Robo dialing wants to avoid less than 6 second calls, and generally keep their average answer ratio and call duration up. The best bet is to answer and hangup within a few seconds