Source note · SIP 488 and codec negotiation failures
For Direct Routing the SBC must support SRTP cipher AES_CM_128_HMAC_SHA1_80 in both offer and answer using the inline key||salt format with optional lifetime.
Checked 2026-09-25
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- SRTP
- 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 SRTP support requirements
Cite this note
APA
WarmTransfer. (2026, September 25). SIP 488 and codec negotiation failures: source note sip-488-codec-failures-teams-srtp-cipher. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-488-codec-failures-teams-srtp-cipher
BibTeX
@misc{warmtransfer-claim-sip-488-codec-failures-teams-srtp-cipher,
title = {SIP 488 and codec negotiation failures: source note sip-488-codec-failures-teams-srtp-cipher},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-488-codec-failures-teams-srtp-cipher},
note = {Source note sip-488-codec-failures-teams-srtp-cipher, checked 2026-09-25}
}