This is an update to my prior post.

Ovolab respoded to my requests for support and provided some suggestions to fix the Intel Mac functionality problems.

Ovolab suggested:
1. Resetting registration code b/c I had used Apple's Migration assistant to bring the older version over from a G5. This was done via terminal through this command "rm ~/Library/Preferences/.PersonalizationSettings.plist" then hitting return, relaunching Plink and re-entering my registration code.
2. Also, they suggest deleting Phlink's preferences.
To do this, first quit Phlink, then, in the Finder, trash the file named "com.ovolab.intouch.plist" which is stored inside the ~/Library/Preferences folder. Now, relaunch Phlink and go through the various preferences, making sure that they are correctly set.... Country, number of rings, etc.. etc...
3. They offered to listen to a recording of the outgoing message quailty issues I was having. However, although the website forum for Phlink says that it's ok to use a powered USB hub, upon re-reading the manual, you will see that there is a strong preference for plugging the Phlink USB hardware DIRECTLY into your mac's USB ports. When I made this change, the outgoing message quality issues disappeared and full functionality continuned.

Once again, great voicemail system application. Very powerful and easy to use (even if it could take a little IT support for a switch from PowerPC to Intel machines in my case).