All inbound and outbound audio can be blocked by the firewall’s application control settings.It causes Polycom phones to show Line Unregistered, URL Calling Is Disabled, Unknown Network Error, Invalid Hostname, a Red Triangle with an Exclamation point in the middle, and other Polycom errors that cause the phone to be unable to make/receive calls.This causes Vertical phones to get stuck in Configuring mode.If the DHCP DNS Servers are set to the same addresses as the System (WAN) DNS servers, it activates a FortiGate software issue that causes DNS Server addresses (DHCP option 6) to not be passed to the phones.You will need to verify it is disabled to prevent just Polycom phones from experiencing intermittent DNS lookup timeouts. DNS relay/proxy is disabled by default but it can be enabled.Therefore, that setting needs to be disabled. RTP processing causes call and fax audio issues.SIP ALG is enabled by default, but it can be disabled.
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