Source note · One-way and no-way audio diagnosis
RFC 4961 gives the reason: NATs without an application layer gateway, and SBCs or media relays behind address-dependent or port-dependent NATs, need endpoints to use symmetric UDP ports to set up bidirectional traffic.
Checked 2026-09-24
- Vendor
- IETF
- Product
- RTP endpoints
- Subsystem
- symmetric RTP
- Deployment
- multi-tenant, on-premises
- Region
- not restricted
- Release range
- RFC 4961
- Checked
- 2026-09-24
Sources
- Symmetric RTP / RTP Control Protocol (RTCP) — IETF / RFC Editor · tier 1 standards and regulators · RFC 4961 section 4 (motivation)
Cite this note
APA
WarmTransfer. (2026, September 24). One-way and no-way audio diagnosis: source note one-way-audio-symmetric-rtp-nat-rationale. WarmTransfer. https://warmtransfer.net/knowledge/claims/one-way-audio-symmetric-rtp-nat-rationale
BibTeX
@misc{warmtransfer-claim-one-way-audio-symmetric-rtp-nat-rationale,
title = {One-way and no-way audio diagnosis: source note one-way-audio-symmetric-rtp-nat-rationale},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/one-way-audio-symmetric-rtp-nat-rationale},
note = {Source note one-way-audio-symmetric-rtp-nat-rationale, checked 2026-09-24}
}