STI Display Implementation and Evolution Chia Li – Comcast Cable August 8, 2018

Let’s Work Together to Advance Consumer Awareness Follow ATIS Display Framework Guidelines and take a step forward to nail down implementation “in an effort to accelerate the reach of Verified Caller ID across analog devices in IP networks, service providers can evaluate the use of conventional CNAM as a vehicle for relaying verification status to the consumer. “ While there are devices like OTT apps that can present more information, such as red cross or green check marks, a majority of land-line phone users still rely on the 15-character display for caller identity. Service providers join force for unified customer experiences to promote awareness and adaptation Agree on a common 15-character display Agree on icons and text strings for smart device display Share customer feedback from trial/deployment Review the feedback and agree on revision if necessary Work with FCC/FTC for consumer awareness/promotion Take into considerations of different stages of STIR/SHAKEN adaptation Initially during the adaptation phase Do not disturb end-user experience initially for calls with failed or no Identity headers Provide positive indication of authetic callers to help restore customer trust Eventually reaching the mature phase Reflect identity check results, positive, negative, or no verification, in a well-defined and easy-to-understand way Reject calls without valid Identity headers upon FCC rulings Analytics continue to play a key role in categorizing and scoring of the purpose/intention of calls. Concerns on privacy and secure identity need to be balanced

Smartphone/OTT Client Smartphone/OTT Client STI Display Template Call ID Status Legacy Phone LED Display Smartphone/OTT Client STI present; Failed verification STI not present Successful verification Scam per analytics Anonymous STIR/SHAKEN Adaptation Phase Call ID Status Legacy Phone LED Display Smartphone/OTT Client STI present; Verification failed (Not scam per analytics) STI not present; No verification STI present; Verification succeeded Scam per analytics Anonymous STIR/SHAKEN Mature Phase

STI Display Proposal – A Symbol-based Approach Call ID Status Legacy Phone LED Display Smartphone/OTT Client STI present; Failed verification John Doe STI not present Successful verification +John Doe Identity Verified Scam per analytics Possible Scam Anonymous STIR/SHAKEN Adaptation Phase Symbols <+,?,!> signify STI status More characters for CNAM STI status not readable Call ID Status Legacy Phone LED Display Smartphone/OTT Client STI present; Verification failed (Not scam per analytics) !John Doe (or phone #) Identity Invalid STI not present; No verification ?John Doe Identity Unverified STI present; Verification succeeded +John Doe Identity Verified Scam per analytics Possible Scam Anonymous STIR/SHAKEN Mature Phase

STI Display Proposal – A Character-based Approach Call ID Status Legacy Phone LED Display Smartphone/OTT Client STI present; Failed verification John Doe STI not present Successful verification [V]John Doe Identity Verified Scam per analytics Possible Scam Anonymous STIR/SHAKEN Adaptation Phase <X,U,V> in square brackets to signify STI status Fewer characters left for CNAM Stronger visual effect Allow readable STI status Call ID Status Legacy Phone LED Display Smartphone/OTT Client STI present; Verification failed (Not scam per analytics) [X]John Doe (or phone #) Identity Invalid STI not present; No verification [U]John Doe Identity Unverified STI present; Verification succeeded [V]John Doe Identity Verified Scam per analytics Possible Scam Anonymous STIR/SHAKEN Mature Phase