Field pattern: Teams Calling Plan users report outbound calls from numbers ported from another carrier being shown as 'Potential Spam' by a US mobile carrier; moderators advise asking that carrier to review the range and opening a Microsoft ticket to check STIR/SHAKEN handling of the ported numbers.
field report · Checked 2026-10-02
- Vendor
- Microsoft
- Product
- Microsoft Teams Phone
- Subsystem
- Calling Plans
- Deployment
- multi-tenant
- Region
- us
- Release range
- 2025
- Status
- field report
- Checked
- 2026-10-02
Sources
- Teams are being flagged as 'Potential Spam' by some carriers — Microsoft Q&A (community) · tier 5 independent technical research · question and moderator replies, September 2025
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting STIR/SHAKEN attestation levels on outbound calls: source note stir-shaken-attestation-troubleshooting-fp-ported-spam. WarmTransfer. https://warmtransfer.net/knowledge/claims/stir-shaken-attestation-troubleshooting-fp-ported-spam
BibTeX
@misc{warmtransfer-claim-stir-shaken-attestation-troubleshooting-fp-ported-spam,
title = {Troubleshooting STIR/SHAKEN attestation levels on outbound calls: source note stir-shaken-attestation-troubleshooting-fp-ported-spam},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/stir-shaken-attestation-troubleshooting-fp-ported-spam},
note = {Source note stir-shaken-attestation-troubleshooting-fp-ported-spam, checked 2026-10-02}
}