Source note · Troubleshooting fax over IP failures
On Unified CM, the Cisco ATA 191 fax mode is chosen on the phone configuration page from Fax passthrough, T.38 fax relay, NSE Fax passthrough G711ulaw, or NSE Fax passthrough G711alaw.
Checked 2026-10-02
- Vendor
- Cisco
- Product
- Cisco ATA 191
- Subsystem
- fax mode
- Deployment
- on-premises
- Region
- not restricted
- Release range
- current as of 2026-10-02
- Checked
- 2026-10-02
Sources
- Cisco ATA 191 Analog Telephone Adapter Administration Guide for Cisco Unified Communications Manager - Configure Fax Services — Cisco Systems · tier 2 current vendor documentation · Configure Fax Services > Fax Mode
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting fax over IP failures: source note fax-over-ip-troubleshooting-ata191-ucm-fax-modes. WarmTransfer. https://warmtransfer.net/knowledge/claims/fax-over-ip-troubleshooting-ata191-ucm-fax-modes
BibTeX
@misc{warmtransfer-claim-fax-over-ip-troubleshooting-ata191-ucm-fax-modes,
title = {Troubleshooting fax over IP failures: source note fax-over-ip-troubleshooting-ata191-ucm-fax-modes},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/fax-over-ip-troubleshooting-ata191-ucm-fax-modes},
note = {Source note fax-over-ip-troubleshooting-ata191-ucm-fax-modes, checked 2026-10-02}
}