Improve fax transmission with your ATA

Publisher

Cisco Webex

URL

https://help.webex.com/en-us/article/fzwl6ab/Improve-fax-transmission-with-your-ATA

Published

2025-05-21

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

Cisco website terms of use; all rights reserved; no-redistribution; short excerpts and locators only

Source notes citing this source

• If Webex Calling ATA fax problems persist, Cisco advises lowering the fax machine baud rate to 9600 or 2400 bps. in context
• Cisco's Webex Calling ATA fax troubleshooting steps include adjusting Error Correction Mode settings and reducing the number of pages per transmission. in context
• Cisco advises setting the fax machine behind a Webex Calling ATA to Fax mode or Auto Answer Fax mode so incoming calls are not treated as voice calls. in context
• Cisco notes that keeping a dedicated PSTN line remains an option for best fax and modem performance instead of faxing through a Webex Calling ATA. in context
• Cisco states that when T.38 is enabled on a Webex Calling ATA, faxes are not encrypted. in context
• In Webex Calling ATA fax guidance, T.38 mode is disabled by default. in context
• Cisco's Webex Calling help article on ATA fax transmission says that enabling T.38 mode can improve fax quality through an ATA. in context
• 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 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

BibTeX

@misc{warmtransfer-cisco-help-fzwl6ab-improve-fax-ata,
  title  = {Improve fax transmission with your ATA},
  author = {{WarmTransfer}},
  year   = {2025},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-help-fzwl6ab-improve-fax-ata},
  note   = {Cisco Webex, accessed 2026-09-24}
}