Yes, So far i didn't try anything else except DC. I thought i will try out in TOR and it worked on the 1st attempt.

This is what happened in both
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In DC i logged in and applied all the settings as stated above and when i got a call back i heard only ringing sound but my other phone never rang.

IN TOR, i just installed and logged in ( not applied in any settings like DC) and called the same number, when i picked up the phone i heard only only one ring sound and my desk phone started ringing.

I do not know on DC why i kept hearing the ringing sound but the phone never rang.