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

2. 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.

3. 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

4. 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

5. Example Displays with STIR/SHAKEN Verified – Legacy Phones

6. Example Displays with STIR/SHAKEN Verified – Smart Devices