Source note · DTMF methods and interoperability failures
In Asterisk, dtmf_mode auto sends RFC 4733 if the other side supports it and in-band otherwise; auto_info sends RFC 4733 if supported and SIP INFO otherwise.
Checked 2026-09-24
- Vendor
- Sangoma
- Product
- Asterisk res_pjsip
- Subsystem
- endpoint configuration
- Deployment
- on-premises
- Region
- not restricted
- Release range
- Latest API docs as of 2026-09-24
- Checked
- 2026-09-24
Sources
- res_pjsip - Asterisk Documentation — Sangoma / Asterisk project · tier 3 vendor-maintained repositories · endpoint > dtmf_mode > auto, auto_info
Cite this note
APA
WarmTransfer. (2026, September 24). DTMF methods and interoperability failures: source note dtmf-interop-asterisk-auto-fallbacks. WarmTransfer. https://warmtransfer.net/knowledge/claims/dtmf-interop-asterisk-auto-fallbacks
BibTeX
@misc{warmtransfer-claim-dtmf-interop-asterisk-auto-fallbacks,
title = {DTMF methods and interoperability failures: source note dtmf-interop-asterisk-auto-fallbacks},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/dtmf-interop-asterisk-auto-fallbacks},
note = {Source note dtmf-interop-asterisk-auto-fallbacks, checked 2026-09-24}
}