SBC pairing checklist

Verified domain on the SBC FQDN

Certified software release

TCP 5061 TLS

OPTIONS reachability

Voice route and policy assigned

Sample numbers only: +1 425 555 0100

Sources and go deeper

Plan Direct Routing — Microsoft Learn — last checked 2026-10.
Certified SBCs for Direct Routing — Microsoft Learn — last checked 2026-10.
RFC 3261 — RFC — last checked 2026-10.
Session border controller — Wikipedia — last checked 2026-10. Wikipedia fallback for background. Confirm the vendor page before you change a tenant
Microsoft Teams blog index — Community — last checked 2026-10. Community index for the Microsoft Teams blog. This is the index, not a claim that a post discusses this room