Source note · Early media and ringback behavior
When a Teams user forwards a call and the caller is a PSTN user, the Direct Routing SIP proxy generates a 181 Call is being forwarded provisional response to the caller.
Checked 2026-09-24
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- call forwarding
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-24
- Checked
- 2026-09-24
Sources
- Teams Phone System Direct Routing: SIP protocol — Microsoft · tier 2 current vendor documentation · Call forwarding
Cite this note
APA
WarmTransfer. (2026, September 24). Early media and ringback behavior: source note early-media-ringback-teams-181-forwarding. WarmTransfer. https://warmtransfer.net/knowledge/claims/early-media-ringback-teams-181-forwarding
BibTeX
@misc{warmtransfer-claim-early-media-ringback-teams-181-forwarding,
title = {Early media and ringback behavior: source note early-media-ringback-teams-181-forwarding},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/early-media-ringback-teams-181-forwarding},
note = {Source note early-media-ringback-teams-181-forwarding, checked 2026-09-24}
}