Wife's iPhone can't connect to our VOIPO home number

[tritch]

One-way audio is typically a sign that your router's firewall is blocking traffic. My suggestion would be to open up a support ticket with Voipo. Make sure you give them all the call reference logs for these failed calls by going to vPanel's Call History and clicking on each call. I'm confident they can figure out the source of the issue.

[Eric Seaberg]

I had issues like that with ANY incoming call until I dealt with my router. I was able to specify a DMZ to my Grandstream device which opens ALL ports to the outside. It's virtually the same as not having a router at all to the modem. That solved all of my probems. It's been working great since.