Did you know Caller-ID information is still potentially being sent — even when Called-ID is blocked? If you have an Asterisk box and use certain SIP trunking providers, you can actually recover Caller-ID information that was not supposed to be sent in the first place.

Flowroute is one SIP trunking provider which sends Caller-ID and other information with calls.

According to the video above, you need to take the call information from such a service provider, strip out the privacy bits and forward the number.

You then take the configuration information, copy it into Asterisk and make some modifications using VI or other visual editor.

You then forward the call to another phone number and voila, the private call becomes a non-private call.

Isn’t telecom cool? For more information on geeky things like this and also tips on how to make money when developing telecom apps, be sure to be at the the Communications Developer Conference September 16-18, 2008 in LA. See you there.

Video Credit: Kevin Mitnick and referral thanks to phant0ms1gnal and engadget.

I should point out the sound went in and out for me on this video in both IE and Firefox so if it happens to you, you aren’t going crazy. Please do not take this as a professional diagnosis however. 😉