Webex Calling advises switching an ATA fax port to T.38 to improve fax quality, but warns that with T.38 enabled faxes are not encrypted, whereas the default setting encrypts fax data from the ATA to the Webex Calling service.
Checked 2026-10-02
- Vendor
- Cisco
- Product
- Webex Calling
- Subsystem
- ATA fax
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-10-02
- Checked
- 2026-10-02
Sources
- Improve fax transmission with your ATA — Cisco (Webex Help Center) · tier 2 current vendor documentation · article body - 'Before you begin' and main procedure
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting analog phones and FXS ports with no dial tone or failed calls: source note analog-fxs-troubleshooting-wxc-fax-t38-unencrypted. WarmTransfer. https://warmtransfer.net/knowledge/claims/analog-fxs-troubleshooting-wxc-fax-t38-unencrypted
BibTeX
@misc{warmtransfer-claim-analog-fxs-troubleshooting-wxc-fax-t38-unencrypted,
title = {Troubleshooting analog phones and FXS ports with no dial tone or failed calls: source note analog-fxs-troubleshooting-wxc-fax-t38-unencrypted},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/analog-fxs-troubleshooting-wxc-fax-t38-unencrypted},
note = {Source note analog-fxs-troubleshooting-wxc-fax-t38-unencrypted, checked 2026-10-02}
}