Source note · Call blocking and analytics labeling remediation
When the blocking code crosses from an IP to a non-IP network, SIP 603+ must map to ISUP code 21; from non-IP to IP, ISUP code 21 with cause location 'user' must map to SIP 603 or 603+.
Checked 2026-09-24
- Vendor
- FCC
- Product
- 47 CFR 64.1200
- Subsystem
- blocking-notification
- Deployment
- pstn
- Region
- us
- Release range
- as amended by 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 · Final rule text, amended § 64.1200(k)(9)(iii)-(iv)
Cite this note
APA
WarmTransfer. (2026, September 24). Call blocking and analytics labeling remediation: source note call-blocking-labeling-interworking-mapping. WarmTransfer. https://warmtransfer.net/knowledge/claims/call-blocking-labeling-interworking-mapping
BibTeX
@misc{warmtransfer-claim-call-blocking-labeling-interworking-mapping,
title = {Call blocking and analytics labeling remediation: source note call-blocking-labeling-interworking-mapping},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/call-blocking-labeling-interworking-mapping},
note = {Source note call-blocking-labeling-interworking-mapping, checked 2026-09-24}
}