@Jogi229 Hi, If you have another modem router that also supports VOIP function, it is recommended to set up on the other one and compare. If you have other landline phones available, please test them...

@jtho2607 Hi, Did you get this VR1600v from your ISP? Based on our experience, you can try the following troubleshooting steps: 1. Ensure the client device does not use Random/Private MAC address. 2....

@Amtsop Hi, How often will the MR600 auto reset? Have you tested plugging it into a stable wall outlet and testing if the auto reset occurs?

@Amtsop Hi, May I confirm the model number? Is it MR600? How do you find out that DDNS is not working properly? You can first refer to this troubleshooting steps: Troubleshooting Guide of DDNS...

@SteveJO Hi, Please make sure the SIM satisfy this specification.

@HH88 Hi, Yes, you can use the US firmware for your CA version.