Most VoIP issues are resolved by mobile phone firmware upgrade. Firmware is the software on your mobile phone and make sure to backup your data before upgrading the firmware, to be on the safe side. Please make changes one at a time and reboot your device each time you make a change, in order to to see if the problem is solved.ġ.) IMPORTANT Please make sure you have the latest firmware for your mobile phone. Your router's firewall (also known as NAT) is blocking certain operations of the VoIP features of your mobile phone.īefore trying to resolve this issue on your router, try the following solutions on your mobile phone VoIP configuration.
If you cannot register or cannot make/receive calls with your mobile phone VoIP feature, you are probably behind firewall.
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