Source note · SRTP and media encryption negotiation
Microsoft's example of an SDES-only offer from Teams to an SBC lists AES_CM_128_HMAC_SHA1_32 as crypto tag 0 ahead of AES_CM_128_HMAC_SHA1_80 as tag 1, on an RTP/SAVP media line.
Checked 2026-09-23
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- media bypass
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-23
- Checked
- 2026-09-23
Sources
- Direct Routing support for media bypass - Microsoft Teams — Microsoft Learn · tier 2 current vendor documentation · Section 'Format for SDES only offer to SBC'
Cite this note
APA
WarmTransfer. (2026, September 23). SRTP and media encryption negotiation: source note srtp-media-security-teams-offer-sha1-32-first. WarmTransfer. https://warmtransfer.net/knowledge/claims/srtp-media-security-teams-offer-sha1-32-first
BibTeX
@misc{warmtransfer-claim-srtp-media-security-teams-offer-sha1-32-first,
title = {SRTP and media encryption negotiation: source note srtp-media-security-teams-offer-sha1-32-first},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/srtp-media-security-teams-offer-sha1-32-first},
note = {Source note srtp-media-security-teams-offer-sha1-32-first, checked 2026-09-23}
}