Source note · Connecting Unified CM to Amazon Connect
The CCP softphone needs outbound UDP 3478 to the Region's TurnNlb endpoints; without it agents see Failed to establish softphone connection and miss calls.
Checked 2026-09-25
- Vendor
- Amazon Web Services
- Product
- Amazon Connect
- Subsystem
- agent phone
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-25
- Checked
- 2026-09-25
Sources
- Set up your network to use the Connect Customer Contact Control Panel (CCP) — Amazon Web Services · tier 2 current vendor documentation · Option 1 table (TurnNlb row); Allow DNS resolution for softphones
Cite this note
APA
WarmTransfer. (2026, September 25). Connecting Unified CM to Amazon Connect: source note cucm-with-amazon-connect-softphone-udp-3478. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-with-amazon-connect-softphone-udp-3478
BibTeX
@misc{warmtransfer-claim-cucm-with-amazon-connect-softphone-udp-3478,
title = {Connecting Unified CM to Amazon Connect: source note cucm-with-amazon-connect-softphone-udp-3478},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-with-amazon-connect-softphone-udp-3478},
note = {Source note cucm-with-amazon-connect-softphone-udp-3478, checked 2026-09-25}
}