Disable SIP ALG
This router has known issues with VoIP services if SIP ALG is not disabled. We recommend disabling the SIP ALG setting on the router. This option is available within the firewall settings under the ‘Application Level Gateway (ALG) Configuration’. The SIP option should be unchecked.
**All routers and firewalls need to have the correct ports forwarded and Whitelisting configured for VOIP service, please click here for more information.