Source note · SIP 488 and codec negotiation failures
With media bypass, non-audio m= lines such as m=video are not stripped by the service, and the SBC must answer each with a corresponding m= line with port zero per RFC 3264.
Checked 2026-09-25
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- media bypass
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-25
- Checked
- 2026-09-25
Sources
- Direct Routing support for media bypass - Microsoft Teams — Microsoft Learn · tier 2 current vendor documentation · Section Handling M lines in SDP
Cite this note
APA
WarmTransfer. (2026, September 25). SIP 488 and codec negotiation failures: source note sip-488-codec-failures-teams-bypass-nonaudio-mlines. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-488-codec-failures-teams-bypass-nonaudio-mlines
BibTeX
@misc{warmtransfer-claim-sip-488-codec-failures-teams-bypass-nonaudio-mlines,
title = {SIP 488 and codec negotiation failures: source note sip-488-codec-failures-teams-bypass-nonaudio-mlines},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-488-codec-failures-teams-bypass-nonaudio-mlines},
note = {Source note sip-488-codec-failures-teams-bypass-nonaudio-mlines, checked 2026-09-25}
}