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Aug 6th, 2022
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How to brand us phone attestation

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The text introduces the concept of Android SafetyNet Remote Attestation System, explaining its function, importance, and relevance in mobile security. The speaker, Colin, has vast experience in mobile technology and has been involved in bug hunting and reporting. He has worked for mobile manufacturers, mobile app security teams, and has contributed to various projects, including the Android Hackers Handbook and a developer guide for smartphone app security in the European Union Network Defense Agency.

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The originating telephone service provider checks the call source and calling number to determine how to attest for the validity of the calling number. Full Attestation (A) The service provider has authenticated the calling party and they are authorized to use the calling number.
So if you see a phone number like this 202 588-6500, youd dial 00-1-202-588-6500.An example of a US phone number 00 (or +) the exit code to dial outside the States. 1 the US country code. 202 the local DC area code. 588-6500 the rest of the embassys number.
Calling the USA: +1 is the US Country Code.
In a SHAKEN/STIR call the originating carrier (Twilio in this case) signs calls with different attestation levels based on knowing the caller and the callers right to use a phone number. The three attestation level are Full Attestation (A), Partial Attestation (B), and Gateway Attestation (C):
You can use the + symbol in place of 011 if dialing from a cell phone. The + sign is usually the same key as 0 on a smartphones keypad. Some countries share a country code. For example, Canada, the United States, some places in the Caribbean, and Guam share 1 as a country code.
If a call is assigned full attestation, it means: The carrier is responsible for originating the call. The carrier has a pre-existing direct relationship with the customer who is making the call and can authenticate and identify this caller.
To format phone numbers in the US, Canada, and other NANP (North American Numbering Plan) countries, enclose the area code in parentheses followed by a nonbreaking space, and then hyphenate the three-digit exchange code with the four-digit number.

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