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Grandstream HT801 not receiving calls

Hi.


I have followed the video guide and all settings seem correct, account is registered, but I am unable to receive calls.

It has worked once or twice with the current settings, but mostly goes straight to voice mail.

Shows as registered on the device, but not on the FF dashboard.

Please can you assist?

It is connected to a ZTE router on Telkom LTE.


I have just reset to factory defaults and configured what I think I need to, it now shows on the dashboard but still not able to receive calls.


An update, I changed the Telkom LTE APN to "unrestricted" as I thought this may be causing an issue, the phone worked to receive calls the first couple of times I tested, then stopped working a bit later.


Please advise if you are able to disable SIP ALG under the NAT settings of your internet router.

I have looked for that option but can't seem to find anything.

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