One-way audio on a Five9 softphone or gateway station most plausibly traces to blocked RTP return traffic on a non-stateful firewall, an active SIP ALG or inspection feature, an overreacting IPS, or Double NAT, since these are the media-path conditions Five9's own requirements single out.
inferred · Checked 2026-10-02
- Vendor
- Five9
- Product
- Five9 Softphone
- Subsystem
- one-way audio
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-10-02
- Status
- inferred
- Checked
- 2026-10-02
Sources
- TCP/UDP Port Requirements for Softphone Customers — Five9 · tier 2 current vendor documentation · Row 1024-65535; read with SIP Firewall Note, IPS note and LAN/WAN Double NAT statement
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting Five9 softphone and station connection problems: source note five9-softphone-troubleshooting-one-way-audio-firewall. WarmTransfer. https://warmtransfer.net/knowledge/claims/five9-softphone-troubleshooting-one-way-audio-firewall
BibTeX
@misc{warmtransfer-claim-five9-softphone-troubleshooting-one-way-audio-firewall,
title = {Troubleshooting Five9 softphone and station connection problems: source note five9-softphone-troubleshooting-one-way-audio-firewall},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/five9-softphone-troubleshooting-one-way-audio-firewall},
note = {Source note five9-softphone-troubleshooting-one-way-audio-firewall, checked 2026-10-02}
}