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Asterisk behind a router needs ports forwarded to process calls and transmit audio successfully both ways.
Users can resolve data blockages by forwarding ports on the firewall and network device. Doing so opens a window to the outside that allows otherwise restricted data to enter the LAN.
Via the router or firewall’s main menu, locate “Port Range Forwarding.” Adjust the ranges for the VoIP phone or analog telephone adaptor (ATA). Set a static IP address for the device if not already configured as such.
For the "Start" and "End" fields, enter the following values:
Save the settings and place a phone call to check if these changes take effective. If not, run port tests with third-party scanners or ask the provider for help.