Source note · Firewall ports and IP ranges for cloud calling
Cisco names AES-CM-128-HMAC-SHA1 as the cipher typically used to encrypt media to Webex services from endpoints using SRTP with SIP signalling and describes it as a mature cipher with proven interoperability between vendors, and the Webex Calling security requirements article gives AES_CM_128_HMAC_SHA1_80 as the only SRTP key supported for secure media.
Checked 2026-09-16
- Vendor
- Cisco
- Product
- Webex
- Subsystem
- media
- Deployment
- not restricted
- Region
- not restricted
- Release range
- not restricted
- Checked
- 2026-09-16
Sources
- Network Requirements for Webex Services — Cisco Systems, Inc. (help.webex.com) · tier 2 current vendor documentation · media encryption paragraph, against the Webex Calling security requirements SRTP row
Cite this note
APA
WarmTransfer. (2026, September 16). Firewall ports and IP ranges for cloud calling: source note fwports-srtp-cipher-is-a-single-suite. WarmTransfer. https://warmtransfer.net/knowledge/claims/fwports-srtp-cipher-is-a-single-suite
BibTeX
@misc{warmtransfer-claim-fwports-srtp-cipher-is-a-single-suite,
title = {Firewall ports and IP ranges for cloud calling: source note fwports-srtp-cipher-is-a-single-suite},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/fwports-srtp-cipher-is-a-single-suite},
note = {Source note fwports-srtp-cipher-is-a-single-suite, checked 2026-09-16}
}