Looking for telephony/VoIP integration recommendation

We are looking for a solution to integrate our telephony and VoIP.  Most of our users will utilize the VoIP but we found in our previous tool that the telephony option was nice to have as a back-up when the inevitable microphone issues arise.  However, with Adobe Connect, we're having trouble finding a solution that is truly integrated.  For example, in one scenario we've investigated, the host can't mute the people on the phone - only on VoIP.  In another scenario, a host must join the conference call in order for it to work for participants (counter-productive since our hosts are on VoIP and we'd like to keep it that way).

Any success stories for a truly integrated solution would be helpful.  I would be interested to know the administrative duties as well (when you set up the meeting do you need to manually select and therefore keep track of when particular numbers are in use?  If so, for companies who are potentially delivering multiple classes simultaneously and across the globe - how do you manage that?).

Thanks in advance!