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Call-ID-Spoofing: What is it? Simply explained

  • Oct 24, 2025
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In connection with telephone numbers and fraud cases, one frequently hears the term "Call-ID-Spoofing". What is it and how to protect yourself before, we will explain in this practical tip.

What is Call ID Spoofing is?

The Call-ID Spoofing is a forbidden method calls from a spoofed number every time.
  • In the "phone display" phone number displayed is not a secure way to identify the caller clearly.
  • Criminals can tamper with telephone connections so that the Called party has another telephone number will be displayed. This process is called Call-ID-Spoofing.
  • The possibility of this criminal act exists both in the non-regulated communication networks such as the Internet, as well as in public networks, such as the classic telephone network.
  • According to the TKG (telecommunications act) prohibits the Call-ID-Spoofing, but is strictly prohibited.
  • It says in Paragraph 66: "[...] Other of the connection participating providers are not allowed to modify transmitted telephone numbers. [...]"
  • The reason for this prohibition of emergency is for example, If a caller can't speak due to injuries, namely, may be traced the number back to be able to come help. This help can not be secured if the emergency services do not have access to the correct caller information.
  • Known by the Call-ID-Spoofing.usually by a failure to comply with this law, since such cases can be viewed at the German Federal network Agency
  • Only in January 2017, a group flew on in Cologne, the easier on the phone as a police officer expenditure and senior citizens in connection to items of value.
What is Call ID Spoofing is? (Source: Pixabay.com)

What is Call ID Spoofing is? - The Way

The basis for the use of the Call-ID to Spoof the introduction of the Call-ID was.
  • This is the identification of a caller using the caller information as the phone number.
  • Criminal, this use of Voice-over-IP techniques (VoIP) or ISDN-connections and manipulate the display of the calling number.
  • Especially in the case of VoIP Calls, the Call-ID Spoofing is very easy, because in conversations over the Internet can be the "display information", as amended, so that not even the call needs to be modified the end of the number.
  • For the Call-ID-Spoofing are there own provider ("Spoofing services"), which will give the opportunity for the input of a number or Information to be displayed on the Display of the Called party. These services are usually free of charge and is now even available as an App.
  • This service provider takes care of then at the same time, also to the forwarding of the call. He forgives so-called Spoofcards, similar to Prepaid cards some credit for Spoofing calls.
  • For the first time, the Call-ID-Spoofing arrived in the U.S. in 2004 by the Hacker Kevin Mitnick to use.
  • Even if the Spoofing is illegal, it provides for collection agencies, journalists or lawyers but a certain amount of value, if this technology is used for investigation or Research.
  • The Call-ID-Spoofing also laid the Basis for a phone-based Phishing, and "SPIT" ("spam over internet telephony").
What is Call ID Spoofing is? - Protection (source: pixabay.com)

What is Call ID Spoofing is? - How to protect yourself

Several relatively easy tips to help you protect yourself against the Call-ID-Spoofing.
  • So it helps often to make the a lot of said "common sense" to prevail.
  • If the alleged judges, police officers, prosecutors, consumers, call guards, or employee pension insurance, banks or well-known company and to the payment of sums of money to ask, you should be skeptical and not complying with requests, warn consumer advocates.
  • All of these authorities and Bodies would never request by phone, cash payments, account data or passwords, queries, or access to the Computer request.
  • In case of doubt, you should ask for such a call to the authority or the company, whether or not the caller described the facts of the case, something is off.
  • It is also important, the time of the call, important Details such as the caller's name and the account number to which any claims for money paid to write. You should then go to the police.
  • But otherwise is a protection against Call-ID Spoofing is possible, such as via the App "TrueCaller". This identifies unknown numbers, which are used by Criminals, and allows you, the call is simply not to accept.
  • Also the Checking of the calling number can help. Apologize briefly to the alleged scammers, and you take a second phone on Hand. Then select the number that is calling you.
  • You will not receive a busy signal, you should be careful, because probably you are eating with the Call-ID-Spoofing up.
  • In addition, you should avoid it in General, personal information on the phone to pass on. You agree instead prefer a call or a written request to be on the safe side.
What is Call ID Spoofing is? True caller (source: play.google.com)
In our next tip we will explain to you, what you against the telephone terrorist can do.

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