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The CPE will need to have egress network access to the Sangoma FAXStation platform via the following:

TCP443HTTPSSangomaCPE uses HTTPS to talk with platform for all fax TX/RX as well as provisioning
UDP4332-4339N/ASangomaCPE connects to platform for remote management/diagnostics/firmware
UDP123NTPPublicCPE contacts for network time protocol if local RTC is not available or skew is too high
UDP53DNSN/ACPE uses DNS for hostname resolution, DNS servers provided by connected network DHCP server, or as specified in manual network configuration


Note, no port forwarding, NAT configuration, etc is required for FAXStation CPE to operate. The above listed ports need to be allowed egress (outbound) access by the CPE (with stateful return traffic allowed).