X-Lite 4 Setup Success

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A little background: I've successfully configured the "Media5-Fone" app on my 4G iPod Touch to handle both inbound and outbound VOIPo calls. This works great and is configured without the use of a STUN server. Voice quality is awesome.

However, I've recently started tinkering with the X-Lite softphone on my Macbook Pro and I can't get it to work without adding the VOIPo STUN server to the X-Lite configuration settings. This would normally be fine, but the voice quality via X-Lite sounds pretty bad when compared to what I'm experiencing when using the Media5-Fone app on the iPT, so I'm wondering if the STUN server is to blame for the poor quality.

At any rate, when I remove the STUN server from the X-Lite settings it seems that the outbound calls that I dial are getting connected but I can't hear the other phone "ring" and I don't hear any voice from the other end. I've tried changing the X-Lite port setting but no dice. Right now X-Lite is using port range 5060-5070. I can also see that X-Lite is registered in the "Devices" section of the VOIPo vPanel.

The MBP and iPT are both connected to the same home wifi network, VOIPo ATA is upstream from my wireless router, and I'm never running the two different SIP applications at the same time. I've also configured the MBP firewall to allow incoming connections to the X-Lite application. Any help?