Source note · Early media and ringback behavior
In Teams Direct Routing, the SBC can receive one 183 per session in non-bypass mode and multiple 183 messages in media bypass mode; in both modes a call may proceed with or without a provisional 183.
Checked 2026-09-24
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- SIP proxy inbound call dialog
- 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 · Inbound call: SIP dialog description, comparison table (Non-bypass mode / Bypass mode)
Cite this note
APA
WarmTransfer. (2026, September 24). Early media and ringback behavior: source note early-media-ringback-teams-183-count. WarmTransfer. https://warmtransfer.net/knowledge/claims/early-media-ringback-teams-183-count
BibTeX
@misc{warmtransfer-claim-early-media-ringback-teams-183-count,
title = {Early media and ringback behavior: source note early-media-ringback-teams-183-count},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/early-media-ringback-teams-183-count},
note = {Source note early-media-ringback-teams-183-count, checked 2026-09-24}
}