Source note · Troubleshooting fax over IP failures
T.38 version 3 (Super G3 speeds) is supported on Cisco IOS from release 15.1(1)T onward.
Checked 2026-10-02
- Vendor
- Cisco
- Product
- Cisco IOS
- Subsystem
- T.38 version
- Deployment
- on-premises
- Region
- not restricted
- Release range
- IOS 15.1(1)T and later
- Checked
- 2026-10-02
Sources
- CUBE Third-Party Interoperability Fax Guidelines — Cisco · tier 2 current vendor documentation · Configure section, T.38 version note
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting fax over IP failures: source note fax-over-ip-troubleshooting-t38-v3-ios-151-1t. WarmTransfer. https://warmtransfer.net/knowledge/claims/fax-over-ip-troubleshooting-t38-v3-ios-151-1t
BibTeX
@misc{warmtransfer-claim-fax-over-ip-troubleshooting-t38-v3-ios-151-1t,
title = {Troubleshooting fax over IP failures: source note fax-over-ip-troubleshooting-t38-v3-ios-151-1t},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/fax-over-ip-troubleshooting-t38-v3-ios-151-1t},
note = {Source note fax-over-ip-troubleshooting-t38-v3-ios-151-1t, checked 2026-10-02}
}