We have deployed around fifty SPA112 ATA's on our wireless network, in South Africa, over the last six months. I recently have started having the same issue with call forwarding. I use the default code *72(desired number). The forwarding rule takes effect but as soon as you try to call the origional number, I get the engaged tone straight away. On mobile phones it just displays it as user busy. Once the call forwarding rule is disabled, calling behaves normally again.
I have tried every combination of settings but can not get the call forwarding to work. Is this a problem on the SPA112 or should I be looking at my SIP server?
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