I have a new SPA112 analog-voip adapter to integrate my analog phone to my VOIP phone system. I assign an extension 5xxx to this adapter and it can make call to my other local phone which is extension number 1xxx. We have a conference system which is using extension 8xxx but when I dial this number 8xxx through my integrated analog phone, I got the busy tone only.
If it is related the setup of dial plan? I am using the default dial plan from the adapter. In order to make it call 8xxx extension, do I need to change something here? I am ok to dial 1xxx extension.
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