Setting up faxing (Poly OBi series ATA)

Publisher

Zoom

URL

https://support.zoom.com/hc/en/article?id=zm_kb&sysparm_article=KB0068395

Published

2026-09-24

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

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

Source notes citing this source

• Zoom states fax over VoIP on Zoom Phone has known limitations and recommends that businesses heavily dependent on large multi-page faxes keep an analog line and traditional fax machine. in context
• Zoom's fax setup for Poly OBi30X, OBi508 and ATA40X on Zoom Phone disables T.38 (T38Enable=Disabled) and uses G.711 passthrough (FaxPassThroughCodec G711U or G711A), with call waiting and conferencing disabled and UseForFaxOnly enabled. in context
• Cloud calling vendors diverge on ATA fax transport: Webex Calling guidance points toward enabling T.38 and RingCentral says it uses T.38 while Zoom's documented OBi setup disables T.38 in favour of G.711 passthrough. inferred in context
• Zoom's OBi fax guidance tells users to lower fax speed (to no less than 9600 bps) and disable Error Correction Mode and compression on the fax machine. in context
• Zoom documents fax setup for the Poly OBi30X OBi508 and ATA40X analog telephone adapters on Zoom Phone. in context
• Zoom's Poly OBi fax setup for Zoom Phone sets T38Enable to Disabled and FaxPassThroughCodec to G711U (North America) or G711A so fax uses G.711 passthrough rather than T.38. in context

Cite this source record

APA

WarmTransfer. (2026, September 24). Setting up faxing (Poly OBi series ATA). WarmTransfer. https://warmtransfer.net/knowledge/sources/zoom-kb0068395-fax-poly-obi

BibTeX

@misc{warmtransfer-zoom-kb0068395-fax-poly-obi,
  title  = {Setting up faxing (Poly OBi series ATA)},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/zoom-kb0068395-fax-poly-obi},
  note   = {Zoom, accessed 2026-09-24}
}