Forum Discussion

bciamarra's avatar
bciamarra
Copper Contributor
Nov 10, 2026

Has anyone noticed a recent change in outbound PSTN ringing behavior in Microsoft Teams?

Previously, when dialing an E.164 number, Teams would play its internal ringing tone and then switch to the PSTN ringback tone once the call reached the carrier.   Recently, the internal Teams ring...
Administrator
calling
microsoft teams
Quality & Performance
Jamony's avatar
Jamony
MCT
Nov 10, 2026

You’re hearing Teams’ local ringback until answer, where carrier audio previously took over. I can’t confirm a published, tenant-wide change matching that symptom. The tone alone also cannot establish where the call has reached: local ringing and carrier early media are different parts of call setup.

 

First identify whether the affected users use Calling Plan, Operator Connect, or Direct Routing. Compare the same destination from another Teams client and a different carrier destination, recording the first affected date and client versions. Check Microsoft 365 Service health and Message Center for your tenant.

 

For Direct Routing, have your voice administrator compare SBC traces for SIP 180, 183 with SDP, and actual early-media packets on working versus affected calls. Don’t apply Microsoft’s inbound-call ringback workaround automatically to this outbound scenario. For Calling Plan or Operator Connect, provide timed examples privately to Microsoft or the operator for investigation.