You can call your provider such as Rogers and request they "Disable SIP ALGs". They can do it remotely.
Login into your router
- Open your browser such as Chrome or Firefox, and enter the address 192.168.1.1
- When requested, enter your password.
- Default username and password -
password: password or [your wifi password]
- Click on the Basic tab
- Click on Gateway Function
- Disable SIP ALG
- Click on Save Changes
- Reboot your router