Source note · SIP scanning and telephony denial of service
Microsoft says to allow Direct Routing signaling to and from all the listed Microsoft Teams IP ranges, not only the addresses returned by DNS.
Checked 2026-09-25
Configure your firewall to allow signaling traffic to and from all Microsoft Teams IP ranges, not only the addresses returned from DNS queries.
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- SIP signaling - firewall
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-25
- Checked
- 2026-09-25
Sources
- Plan Direct Routing — Microsoft (Microsoft Learn) · tier 2 current vendor documentation · SIP signaling: FQDNs > Important note
Cite this note
APA
WarmTransfer. (2026, September 25). SIP scanning and telephony denial of service: source note sip-scanning-tdos-ms-dr-firewall-all-ranges. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-scanning-tdos-ms-dr-firewall-all-ranges
BibTeX
@misc{warmtransfer-claim-sip-scanning-tdos-ms-dr-firewall-all-ranges,
title = {SIP scanning and telephony denial of service: source note sip-scanning-tdos-ms-dr-firewall-all-ranges},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-scanning-tdos-ms-dr-firewall-all-ranges},
note = {Source note sip-scanning-tdos-ms-dr-firewall-all-ranges, checked 2026-09-25}
}