The Microsoft SBA Server uses port 443 to communicate with Microsoft 365, and that port must be allowed on the firewall.
Checked 2026-09-30
- Vendor
- Microsoft
- Product
- Microsoft Teams Phone
- Subsystem
- Direct Routing SBA
- Deployment
- direct-routing
- Region
- not restricted
- Release range
- current as of 2026-09-30
- Checked
- 2026-09-30
Sources
- Survivable Branch Appliance for Direct Routing — Microsoft (Microsoft Learn) · tier 2 current vendor documentation · Prerequisites, bullet 6
Cite this note
APA
WarmTransfer. (2026, September 30). Setting up a Survivable Branch Appliance for Teams Direct Routing: source note teams-sba-setup-m365-port. WarmTransfer. https://warmtransfer.net/knowledge/claims/teams-sba-setup-m365-port
BibTeX
@misc{warmtransfer-claim-teams-sba-setup-m365-port,
title = {Setting up a Survivable Branch Appliance for Teams Direct Routing: source note teams-sba-setup-m365-port},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/teams-sba-setup-m365-port},
note = {Source note teams-sba-setup-m365-port, checked 2026-09-30}
}