...
port 3478 UDP/TCP must be opened at least for the host stun.ucontactcloud.com
port 8089 UDP/TCP must be opened at least for the host (ucontactinstance).ucontactcloud.com
port 443 UDP/TCP must be opened at least for the host (ucontactinstance).ucontactcloud.com
ports 10000-2000 UDP must be opened at least for the host (ucontactinstance).ucontactcloud.com
access to the site http://cacerts.geotrust.com/GeoTrustRSACA2018.crt and redirector.gvt1.com/ must be enabled in order to allow browsers to validate uContact SSL certificate.
Habilitar acceso al sitio de Licenciator para las activaciones de las licencias: us-central1-licenciator.cloudfunctions.net/api/servers/getLicence
Habilitar acceso al sitio de Montioreo de la herramienta: monitor.ucontactcloud.com
access to the following IP´s (104.197.204.63 , 74.125.134.127) used by google chrome.
verify that SIP - ALG is not active on the local or border network devices.
verify that IPS - detection is not active because it can cause VoIP packet discard and voice problemas (unespected call drops).
domain *.github.com must be enable for system updates
...