Source note · SRTP and media encryption negotiation
AES_CM_128_HMAC_SHA1_80 keyed by SDES is the one SRTP configuration that both Teams Direct Routing and Webex Calling document as required or supported, so an SBC serving both needs it in its crypto list.
inferred · Checked 2026-09-23
- Vendor
- multi-vendor
- Product
- Teams Phone Direct Routing; Webex Calling
- Subsystem
- interop
- Deployment
- multi-tenant, hybrid
- Region
- not restricted
- Release range
- current as of 2026-09-23
- Status
- inferred
- Checked
- 2026-09-23
Sources
- Direct Routing support for media bypass - Microsoft Teams — Microsoft Learn · tier 2 current vendor documentation · Section 'SRTP support requirements' combined with cisco-help-jwkbt2-security-requirements 'Requirements for SIP and media'
Cite this note
APA
WarmTransfer. (2026, September 23). SRTP and media encryption negotiation: source note srtp-media-security-common-denominator-sha1-80. WarmTransfer. https://warmtransfer.net/knowledge/claims/srtp-media-security-common-denominator-sha1-80
BibTeX
@misc{warmtransfer-claim-srtp-media-security-common-denominator-sha1-80,
title = {SRTP and media encryption negotiation: source note srtp-media-security-common-denominator-sha1-80},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/srtp-media-security-common-denominator-sha1-80},
note = {Source note srtp-media-security-common-denominator-sha1-80, checked 2026-09-23}
}