Please note: If your router is supported by Inclarity, they are responsible for the configuration file and for checking the below. If the router is not supported by Inclarity, please ensure the below checks are made:
SIP ALG must be disabled
SIP ALG causes issues with VoIP services and must be disabled to ensure it does not interfere with calls or VoIP features. To check if SIP ALG is active, telnet into the router and use the following command
sys sip_alg ?
To disable SIP ALG, enter the following command
sys sip_alg 0