Source note · Call blocking and analytics labeling remediation
FCC 25-15 allows a standard SIP 603 to continue where ISUP code 21 has been translated into a standard 603 that cannot be distinguished as a 603+.
Checked 2026-09-24
- Vendor
- FCC
- Product
- FCC 25-15
- Subsystem
- blocking-notification
- Deployment
- pstn
- Region
- us
- Release range
- FCC 25-15
- Checked
- 2026-09-24
Sources
- Advanced Methods To Target and Eliminate Unlawful Robocalls (final rule; FCC 25-15), 90 FR 13416 — Office of the Federal Register / Federal Communications Commission · tier 1 standards and regulators · Synopsis, discussion of 603+ implementation
Cite this note
APA
WarmTransfer. (2026, September 24). Call blocking and analytics labeling remediation: source note call-blocking-labeling-isup21-translated-603. WarmTransfer. https://warmtransfer.net/knowledge/claims/call-blocking-labeling-isup21-translated-603
BibTeX
@misc{warmtransfer-claim-call-blocking-labeling-isup21-translated-603,
title = {Call blocking and analytics labeling remediation: source note call-blocking-labeling-isup21-translated-603},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/call-blocking-labeling-isup21-translated-603},
note = {Source note call-blocking-labeling-isup21-translated-603, checked 2026-09-24}
}