Webex Calling devices, Webex App, and Webex Devices Ephemeral UDP and TCP Host-defined 53 Used for DNS lookups to discover the IP addresses of Webex Calling services in the cloud. Even though typical DNS lookups are done over UDP, some may require TCP, if the query responses can’t fit i...
Windows Firewall with Advanced Security is a stateful, host-based firewall that filters inbound and outbound traffic based on firewall rules. Exchange 2010 Setup creates Windows Firewall rules to open the ports required for server and client communication on each server role. Therefore, you no ...
Call signaling to PSTN gateway (SIP TLS) Local Gateway internal NIC 8000-65535 TCP Your ITSP PSTN GW or Unified CM Depends on PSTN option (for example, typically 5060 or 5061 for Unified CM) Call media to PSTN gateway (SRTP/SRTCP) Local Gateway internal NIC 8000-48199†* UDP Your IT...