Source note · Fax and T.38 in cloud calling
For Webex Calling ATA fax the documented choice is a trade-off between the encrypted default path and T.38 which improves reliability but is unencrypted; no Webex source found documents RFC 7345 secure T.38.
inferred · Checked 2026-09-24
- Vendor
- Cisco
- Product
- Webex Calling
- Subsystem
- fax security
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-24
- Status
- inferred
- Checked
- 2026-09-24
Sources
- Improve fax transmission with your ATA — Cisco Webex · tier 2 current vendor documentation · T.38 mode guidance; compared with rfc-7345-udptl-over-dtls Section 1
Cite this note
APA
WarmTransfer. (2026, September 24). Fax and T.38 in cloud calling: source note fax-t38-wxc-encryption-tradeoff. WarmTransfer. https://warmtransfer.net/knowledge/claims/fax-t38-wxc-encryption-tradeoff
BibTeX
@misc{warmtransfer-claim-fax-t38-wxc-encryption-tradeoff,
title = {Fax and T.38 in cloud calling: source note fax-t38-wxc-encryption-tradeoff},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/fax-t38-wxc-encryption-tradeoff},
note = {Source note fax-t38-wxc-encryption-tradeoff, checked 2026-09-24}
}