Turn off SIP ALG
Under the NAT heading on the router, uncheck the box for the SIP ALG. This should allow proper functioning of the router.
NOTE: The information provided above is from another OnSIP customer offering these settings for other customers with a similar device. OnSIP does not sell nor monitor equipment and/or it’s firmware updates/etc. The settings of routers can change and are out of the control of OnSIP. For best results, reach out to the manufacturer directly.
Optimize your network for business VoIP with the right router