Mailinglist Archive: opensuse (770 mails)

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Re: [opensuse] connecting my telephone to the internet
Carlos E. R. wrote:
On the other hand, do you remember those movies where the bad guy makes a phone
call to the
police and the call has to last less than 20" or he is identified? That's
rubbish, you are
identified on on the first second, while ringing, at least on countries like

Actually, it didn't used to be rubbish. I have worked in telecom going back 40 years and at one point early in my career, I actually worked on some of the old step by step relay systems and even learned to trace calls through them. There's no way it could be done in only 20 seconds. Modern, SS7 sytstems are of course quite different. Also, the phone ID can be spoofed. I get plenty of telemarketing calls where that is done. The originating switch or PBX is the one that provides the ID and it can be set to anything. For example, according to my phone's log, I received a call on Aug 10 from 10000000000. That is in no way a valid number, yet it managed to reach my phone. This is via a regular phone company that provides my home phone. Also, a few years ago, I worked on a phone system where the customer insisted there be no caller ID on outgoing calls, as it was for a woman's shelter and they didn't want anyway for someone to track where those women were. I have also set up VoIP PBXs, where someone in one location could call through another location and appear as though they originated at that 2nd location. It's not at all difficult to do with today's equipment, so accepting from the phone company is not quite as secure as you think.

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