Source note · Fax and T.38 in cloud calling
For third-party interoperability Cisco recommends configuring CUBE with fax protocol t38 version 0 ls-redundancy 0 hs-redundancy 0 fallback none with dial-peer configuration taking precedence over global settings.
Checked 2026-09-24
fax protocol t38 version 0 ls-redundancy 0 hs-redundancy 0 fallback none
- Vendor
- Cisco
- Product
- Cisco Unified Border Element
- Subsystem
- fax interworking
- Deployment
- on-premises
- Region
- not restricted
- Release range
- IOS 15.x era (2013 tech note)
- Checked
- 2026-09-24
Sources
- CUBE Third-Party Interoperability Fax Guidelines — Cisco · tier 2 current vendor documentation · CUBE Configuration section
Cite this note
APA
WarmTransfer. (2026, September 24). Fax and T.38 in cloud calling: source note fax-t38-cube-interop-config. WarmTransfer. https://warmtransfer.net/knowledge/claims/fax-t38-cube-interop-config
BibTeX
@misc{warmtransfer-claim-fax-t38-cube-interop-config,
title = {Fax and T.38 in cloud calling: source note fax-t38-cube-interop-config},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/fax-t38-cube-interop-config},
note = {Source note fax-t38-cube-interop-config, checked 2026-09-24}
}