Firewall Whitelist


date desc
3 Mar 2020 initial
19 May 2021 Added Cloud Services Gen 2
5 May 2022 Removed old Cloud Services, modified Gen 2 listing (Azure Service Bus based)
4 Aug 2023 Licensing hostname changed, also added docs.signals-engr.net
16 Oct 2024 Debian Updates
25 Sep 2025 Added domains for outgoing NUSO SMS/MMS

This table lists the outbound hosts needed when ICON Signals is deployed at a customer site.

SERVICE           DOMAIN/HOST(S)                   PORTS

Teamviewer        *.teamviewer.com                 443, 80, 5938 (tcp & udp)

Twilio            *.twilio.com                     443

NUSO              *.brightlink.com                 4849, 8888

SMTP (Gmail)      smtp.gmail.com                   587
POP3 (Gmail)      pop.gmail.com                    995


ICON Cloud Svcs   *.servicebus.windows.net         443, 5671, 5672
(Overwatch)       iconvn3.servicebus.windows.net
                  iconvn4.servicebus.windows.net

ICON Licensing    licensing.iconvn.com             8320

Signals Docs      docs.signals-engr.net            443
and Installers

Alcatel Rainbow   openrainbow.com                  443, 80
                  agent.openrainbow.com
                  web.openrainbow.com
                  cdn.openrainbow.com
                  mail.openrainbow.com
                  smtp.openrainbow.com
                  www.openrainbow.com
                  api.openrainbow.com
                  hub.openrainbow.com
                  support.openrainbow.com

Debian Updates    *.debian.org                     443, 80
                  deb.debian.org
                  security.debian.org
                  www.debian.org

npm               www.npmjs.org                    443, 80
                  registry.npmjs.org

2018-2025 ICON Voice Networks