Try to connect an analogue phone in paralel to CO and check if it rings. There should be no differences.
Then connect an analogue extension to this CO (take care to disconnect external line first!) and call on this extension.
The line button should ring.
This will help you to decide if the CO is...
I have the right licenses for SIP extensions and I want to add 2 remote fax machines over IP (I have optical fiber only).
I used for tests Grandstream GXW4004 and it worked, but now I want to use Audiocodes MP118. I looked on web for programming, I tried different programming, but it doesn't...
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