Five9 softphone RTP uses outbound UDP 1024-65535, and if the firewall is not stateful inbound rules must be configured to allow the return traffic.
Checked 2026-10-02
If you are not using a stateful firewall, you must configure inbound rules to allow return traffic.
- Vendor
- Five9
- Product
- Five9 Softphone
- Subsystem
- network ports
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-10-02
- Checked
- 2026-10-02
Sources
- TCP/UDP Port Requirements for Softphone Customers — Five9 · tier 2 current vendor documentation · TCP/UDP Port Requirements for Softphone Customers; row 1024-65535
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting Five9 softphone and station connection problems: source note five9-softphone-troubleshooting-rtp-return-traffic. WarmTransfer. https://warmtransfer.net/knowledge/claims/five9-softphone-troubleshooting-rtp-return-traffic
BibTeX
@misc{warmtransfer-claim-five9-softphone-troubleshooting-rtp-return-traffic,
title = {Troubleshooting Five9 softphone and station connection problems: source note five9-softphone-troubleshooting-rtp-return-traffic},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/five9-softphone-troubleshooting-rtp-return-traffic},
note = {Source note five9-softphone-troubleshooting-rtp-return-traffic, checked 2026-10-02}
}