If you use a Broadsoft switch, there is a push for you to use BroadCloud for conferencing and other services. You have options.
VidTel is looking to partner with service providers for video conferencing.
StartMeeting also has a white-label service.
Level3 has a number of conferencing options for white-label including audio, web, and event services.
G+ Hangout and Skype are good for SOHO and consumer, but larger sized businesses use conferencing now. Why not take advantage of it?
I also rep for InterCall, PGi and know the folks at ILD/RollCall.
I don't know if you saw the announcement this morning from Sprint, but Sprint is using Parallels for cloud services. If you want to learn more about Parallels, my pal Jack Brandt (my co-speaker on 50 Ideas in 50 Minutes) is a Strategic Partner Manager at Parallels.
Full Disclosure: I rep Sprint too.