Source note · Troubleshooting fax over IP failures
For inbound faxes, Telnyx expects the customer side to send the T.38 re-INVITE; unchecking Enable T38 FAX gateway makes Telnyx refuse T.38 re-INVITEs so the call stays on G.711.
Checked 2026-10-02
- Vendor
- Telnyx
- Product
- Telnyx SIP trunking
- Subsystem
- T.38
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-10-02
- Checked
- 2026-10-02
Sources
- Fax service with Telnyx (via T.38 or G711) — Telnyx · tier 2 current vendor documentation · Inbound fax section; Enable T38 FAX gateway option
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting fax over IP failures: source note fax-over-ip-troubleshooting-telnyx-inbound-cust. WarmTransfer. https://warmtransfer.net/knowledge/claims/fax-over-ip-troubleshooting-telnyx-inbound-cust
BibTeX
@misc{warmtransfer-claim-fax-over-ip-troubleshooting-telnyx-inbound-cust,
title = {Troubleshooting fax over IP failures: source note fax-over-ip-troubleshooting-telnyx-inbound-cust},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/fax-over-ip-troubleshooting-telnyx-inbound-cust},
note = {Source note fax-over-ip-troubleshooting-telnyx-inbound-cust, checked 2026-10-02}
}