You can register your vbuzzer account with
www.voxalot.com, then register your voxalot account with
www.easypabx.com, and have everybody logon to
www.easypabx.com as extension.
Up to a maximum of two callers can use the same account at any one time and
www.easypabx.com has IVR, voice mail, hunt group, ring group, conference, call back, DISA etc. etc. It will even direct incoming calls directly to extension using CID without involving IVR. It takes a couple of days to set it up properly but once it's setup, it will work in the backgroup. The best thing is, you don't even need a computer to run it.
The reason you have to use voxalot.com is because vbuzzer does not work directly with easypabx.com.