Source note · Fax and T.38 in cloud calling
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 · Checked 2026-09-24
- Vendor
- multi-vendor
- Product
- cloud calling ATA fax
- Subsystem
- fax transport choice
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-24
- Status
- inferred
- Checked
- 2026-09-24
Sources
- Setting up faxing (Poly OBi series ATA) — Zoom · tier 2 current vendor documentation · Codec settings step; compared with cisco-help-fzwl6ab-improve-fax-ata T.38 guidance and ringcentral-fax-set-up-ata T.38 paragraph
Cite this note
APA
WarmTransfer. (2026, September 24). Fax and T.38 in cloud calling: source note fax-t38-vendor-t38-posture-diverges. WarmTransfer. https://warmtransfer.net/knowledge/claims/fax-t38-vendor-t38-posture-diverges
BibTeX
@misc{warmtransfer-claim-fax-t38-vendor-t38-posture-diverges,
title = {Fax and T.38 in cloud calling: source note fax-t38-vendor-t38-posture-diverges},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/fax-t38-vendor-t38-posture-diverges},
note = {Source note fax-t38-vendor-t38-posture-diverges, checked 2026-09-24}
}