Incoming calls not ringing

[Russell]

The Answer:

This is so simple....
Viopo assigns a temporary phone number when you get their service (example 562-123-4567). My orginal (T-mobile Voip) service has my local number (example 303-987-6543).

[nice explanation snipped]

Hope this make sense. I hope this helps someone else.

Excellent information for the newbie (someone who has never experienced voip before or has had voip before but has made no attempt to understand the porting / call forwarding / caller-id spoofing process ) :-).