The Telnyx API v1 CNAM lookup was discontinued effective 10/01/2022. Too bad – I was still using the Telnyx source module for CID Superfecta.
The replacement is here:
The query type parameter for CNAM is “caller-name”.
WARNING: This API currently has a bug: it returns both caller name and LRN and therefore costs $0.003 + $0.0015 (standard low volume pricing).