Source note · TLS certificates and secure SIP failures
Cisco lists 14 TLS cipher suites supported for secure SIP in Webex Calling, of which TLS_AES_256_GCM_SHA384 is the only one at 256 bits and the remaining 13 are AES-128 suites spanning the TLS 1.3 AES_128_GCM form and the ECDHE ECDH and DHE key exchanges in GCM and CBC modes.
Checked 2026-09-16
- Vendor
- Cisco
- Product
- Webex Calling
- Subsystem
- transport security
- Deployment
- not restricted
- Region
- not restricted
- Release range
- not restricted
- Checked
- 2026-09-16
Sources
- Security requirements for Webex Calling — Cisco Systems, Inc. (help.webex.com) · tier 2 current vendor documentation · Requirements for SIP and media table, TLS ciphers row, read as cells
Cite this note
APA
WarmTransfer. (2026, September 16). TLS certificates and secure SIP failures: source note siptls-fourteen-ciphers-one-at-256-bits. WarmTransfer. https://warmtransfer.net/knowledge/claims/siptls-fourteen-ciphers-one-at-256-bits
BibTeX
@misc{warmtransfer-claim-siptls-fourteen-ciphers-one-at-256-bits,
title = {TLS certificates and secure SIP failures: source note siptls-fourteen-ciphers-one-at-256-bits},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/siptls-fourteen-ciphers-one-at-256-bits},
note = {Source note siptls-fourteen-ciphers-one-at-256-bits, checked 2026-09-16}
}