For Microsoft 365, Office 365 and GCC, the SBC connects over SIP/TLS to destination port 5061 on sip.pstnhub.microsoft.com, sip2.pstnhub.microsoft.com and sip3.pstnhub.microsoft.com, in that priority order.
Checked 2026-09-25
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- SIP signaling
- Deployment
- multi-tenant
- Region
- global (commercial and gcc; gcc high and dod use different fqdns)
- 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 table; SIP signaling ports table
Cite this note
APA
WarmTransfer. (2026, September 25). Unified CM and Teams Phone coexistence during a migration: source note cucm-teams-coexistence-dr-sip-signaling. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-teams-coexistence-dr-sip-signaling
BibTeX
@misc{warmtransfer-claim-cucm-teams-coexistence-dr-sip-signaling,
title = {Unified CM and Teams Phone coexistence during a migration: source note cucm-teams-coexistence-dr-sip-signaling},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-teams-coexistence-dr-sip-signaling},
note = {Source note cucm-teams-coexistence-dr-sip-signaling, checked 2026-09-25}
}