Improve fax transmission with your ATA

Publisher

Cisco (Webex Help Center)

URL

https://help.webex.com/en-us/article/fzwl6ab/Improve-Fax-Transmission-with-Your-ATA

Published

2025-05-21

Updated

unknown

Accessed

2026-09-30

HTTP status

200

License

Cisco proprietary; all rights reserved; no-redistribution; short excerpts and locators only

Source notes citing this source

• Alarm panels and elevator emergency phones that signal with modem-style tones or dialers are data devices in the sense of Cisco's caution, so the recommendation to keep a dedicated PSTN line applies to them at least as strongly as to fax. inferred in context
• Cisco cautions that data devices such as fax machines and modems may not function optimally with an ATA, and recommends a dedicated PSTN line for best performance. in context
• The fax machine should be set to Fax or Auto Answer Fax mode so that incoming calls are not treated as voice calls. in context
• If fax problems persist after T.38 is enabled, Cisco's suggested measures are to restart the fax machine and ATA, check connections and the ATA status in Control Hub, lower the baud rate to 9600 or 2400 bps, adjust Error Correction Mode, and send fewer pages per transmission. in context
• By default an ATA on Webex Calling sends faxes with T.38 mode disabled, and in that default mode the fax stays encrypted between the ATA and the Webex Calling service. in context
• Enabling T.38 mode for an ATA on Webex Calling can resolve fax transmission problems, but it disables encryption on faxes. in context

Cite this source record

APA

WarmTransfer. (2025, May 21). Improve fax transmission with your ATA. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-help-fzwl6ab-improve-fax-ata-b

BibTeX

@misc{warmtransfer-cisco-help-fzwl6ab-improve-fax-ata-b,
  title  = {Improve fax transmission with your ATA},
  author = {{WarmTransfer}},
  year   = {2025},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-help-fzwl6ab-improve-fax-ata-b},
  note   = {Cisco (Webex Help Center), accessed 2026-09-30}
}