I am testing this service at my parents house who are living in another location to see if they can use this when they move away from telkom.
I am able to receive calls, but outgoing calls do not work. I do get a dial tone on the phone.
On the website it shows Online 47ms Grandstream HT801 126.96.36.199.
It could very well be a setting on the grandstream device. I will see if I can search the forum for the solution because I seem to remember someone else recently having this exact issue. I am not overly familiar with the HT ATA's have you used the youtube video one of our members created as a reference?