What happens to call quality if the operator's infrastructure has issues?

Call quality degrades or calls fail entirely if the certified operator's network experiences latency spikes, packet loss, or outages, because all PSTN traffic flows through the operator's infrastructure before reaching Microsoft's platform. The Teams client may show call quality warnings, but the root cause sits in the carrier's network, not in Teams itself.

Operators that peer directly with Microsoft Azure through dedicated connections typically deliver more consistent quality than those routing through intermediary networks, because fewer hops between the carrier and Microsoft mean fewer points of failure. Atlantech Online uses direct Azure peering and owns its own multi-terabit fiber backbone and data centers, which reduces dependence on third-party transit providers. The company commits to 99.99% uptime on Operator Connect (backed by shared service level agreements between Microsoft and the certified operator) and maintains 99.999% uptime on its own network, ranked in the top 3% globally per CAIDA. Organizations evaluating carriers should ask whether the operator peers directly with Azure or routes through intermediaries, and whether the operator owns its physical network or leases capacity from another provider.