Source note · Inventorying a legacy PBX before migration
In a Teams Calling Plan port request, the billing telephone number must match the losing provider's records and any account freeze must be removed, or the port request is rejected.
Checked 2026-10-14
If the BTN is incorrect or there's a freeze on the account, your port request will be rejected after submitting.
- Vendor
- Microsoft
- Product
- Teams Phone
- Subsystem
- number porting
- Deployment
- multi-tenant
- Region
- us
- Release range
- current as of 2026-10-14
- Checked
- 2026-10-14
Sources
- Transfer phone numbers to Microsoft Teams — Microsoft · tier 2 current vendor documentation · Transfer phone numbers to Microsoft Teams > Porting wizard - New (U.S. & Canada) > Billing telephone number (BTN)
Cite this note
APA
WarmTransfer. (2026, October 14). Inventorying a legacy PBX before migration: source note pbx-discovery-inventory-port-btn-must-match. WarmTransfer. https://warmtransfer.net/knowledge/claims/pbx-discovery-inventory-port-btn-must-match
BibTeX
@misc{warmtransfer-claim-pbx-discovery-inventory-port-btn-must-match,
title = {Inventorying a legacy PBX before migration: source note pbx-discovery-inventory-port-btn-must-match},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/pbx-discovery-inventory-port-btn-must-match},
note = {Source note pbx-discovery-inventory-port-btn-must-match, checked 2026-10-14}
}