Source note · DNS SRV and service discovery for SIP
For Microsoft 365, Office 365 and GCC, Direct Routing SBCs connect to sip.pstnhub.microsoft.com, sip2.pstnhub.microsoft.com and sip3.pstnhub.microsoft.com in primary, secondary and tertiary order, with separate sip*.ipv6.pstnhub.microsoft.com names for IPv6 SBCs.
Checked 2026-09-24
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- SIP signaling
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-24
- Checked
- 2026-09-24
Sources
- Plan Direct Routing — Microsoft (Microsoft Learn) · tier 2 current vendor documentation · SIP signaling: FQDNs
Cite this note
APA
WarmTransfer. (2026, September 24). DNS SRV and service discovery for SIP: source note dns-srv-voice-msdr-connection-points. WarmTransfer. https://warmtransfer.net/knowledge/claims/dns-srv-voice-msdr-connection-points
BibTeX
@misc{warmtransfer-claim-dns-srv-voice-msdr-connection-points,
title = {DNS SRV and service discovery for SIP: source note dns-srv-voice-msdr-connection-points},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/dns-srv-voice-msdr-connection-points},
note = {Source note dns-srv-voice-msdr-connection-points, checked 2026-09-24}
}