Malicious caller identification


 * https://en.wikipedia.org/wiki/Malicious_caller_identification

*57

Customer Originated Trace - Provides the recipient of an obscene, harassing, or threatening call the ability to request an auto-trace of the last call received (source: http://www.jdbsound.com/work/starcodes.html)

Verizon
 * https://www.verizon.com/support/residential/phone/homephone/calling+features/call+trace/questions+and+answers/96525.htm