Under FCC rules a carrier that delivers an unqueried call to a ported number to a local exchange carrier's switch is expected to have performed the database query, and the LEC may block such an unqueried call only if performing the query is likely to impair network reliability.
Checked 2026-10-02
the local exchange carrier may block the unqueried call only if performing the database query is likely to impair network reliability
- Vendor
- not restricted
- Product
- not restricted
- Subsystem
- lnp-query
- Deployment
- pstn
- Region
- us
- Release range
- current as of 2026-10-02
- Checked
- 2026-10-02
Sources
- 47 CFR § 52.26 - NANC Recommendations on Local Number Portability Administration — Legal Information Institute (Cornell Law School), reproducing the Code of Federal Regulations · tier 1 standards and regulators · 47 CFR 52.26(b) (unqueried-call provision; paragraph number not confirmed in rendering)
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting calls that fail to ported numbers after cutover: source note post-port-routing-troubleshooting-unqueried-call-blocking. WarmTransfer. https://warmtransfer.net/knowledge/claims/post-port-routing-troubleshooting-unqueried-call-blocking
BibTeX
@misc{warmtransfer-claim-post-port-routing-troubleshooting-unqueried-call-blocking,
title = {Troubleshooting calls that fail to ported numbers after cutover: source note post-port-routing-troubleshooting-unqueried-call-blocking},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/post-port-routing-troubleshooting-unqueried-call-blocking},
note = {Source note post-port-routing-troubleshooting-unqueried-call-blocking, checked 2026-10-02}
}