Survivable branch timeline

What remains when the path to Microsoft 365 drops. Lesson: Mixing them in one tenant.

Sources and go deeper

Same checked list as T05-R06-mixing-them-in-one-tenant.html.

Plan Direct Routing — Microsoft Learn — last checked 2026-10.
PSTN connectivity options — Microsoft Learn — last checked 2026-10.
RFC 3261 — RFC — last checked 2026-10.
Public switched telephone network — Wikipedia — last checked 2026-10. Wikipedia fallback for background. Confirm the vendor page before you change a tenant
Session Initiation Protocol — 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

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