STIR/SHAKEN Display Initial Implementation February 19, 2019 Chia Li, Comcast

Let’s Work Together to Advance Consumer Awareness and Acceptance Propose convergence on an initial implementation for successful validation For 15-character LED display of legacy phones/answering machines For icon and text string on smart devices Additional treatments based on analytics are determined by termination service providers. Carrier interop will start soon, let’s understand and be consistent of what end users will receive when incoming calls are signed and verified.

STIR/SHAKEN Display – Initial Implementation Call ID Status Legacy Phone 15-char LED Display Smart Devices STI present; Failed validation John Doe or <SPAM> STI not present Successful validation [V]John Doe or [V]<SPAM> [John Doe or <SPAM> Verified Anonymous w/STI failed or no STI Anonymous Anonymous w/STI verified [V]Anonymous STIR/SHAKEN Display Initial Implementation <SPAM>: A spam warning text string per analytics and SP’s choice

Additional Considerations LIDB sanitization process Make sure STIR/SHAKEN indicators are not included Extra attention to get down to 12 CNAM? Multiple layers of defense against spoofing STIR/SHAKEN indicators Service provider subscriber provisioning process SBC screening LIDB/CNAM DB screening STI-VS screening End user device enhancement for talking call ID

Example Displays with STIR/SHAKEN Verified – Legacy Phones

Example Displays with STIR/SHAKEN Verified – Smart Devices