Source note · Troubleshooting fax over IP failures
For outbound faxes, Telnyx by default sends the T.38 re-INVITE itself once fax tone is detected; the initiator can be set to Telnyx, Customer, or Disabled.
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 · Outbound fax / T.38 re-INVITE settings
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting fax over IP failures: source note fax-over-ip-troubleshooting-telnyx-outbound-reinv. WarmTransfer. https://warmtransfer.net/knowledge/claims/fax-over-ip-troubleshooting-telnyx-outbound-reinv
BibTeX
@misc{warmtransfer-claim-fax-over-ip-troubleshooting-telnyx-outbound-reinv,
title = {Troubleshooting fax over IP failures: source note fax-over-ip-troubleshooting-telnyx-outbound-reinv},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/fax-over-ip-troubleshooting-telnyx-outbound-reinv},
note = {Source note fax-over-ip-troubleshooting-telnyx-outbound-reinv, checked 2026-10-02}
}