The audio conferencing feature of Office Communicator Release 2 is probably the most measurable of ROI savings in this new release. Traditional conference call services are expensive. Organizations could see significant reductions in the amounts paid for dial-in meeting services purchased from teleconferencing vendors by replacing them with IP network-based conferencing capabilities.Consider what your organization spends in 3rd party audio-conferencing in one month!

For a more in-depth view of cost saving with R2 audio-conferencing check out the following white paper: The Compelling Case for Conferencing by Brent Kelly, Senior Analyst of Wainhouse Research and Marty Parker, Principal of Unicomm Consulting LLC. Among other findings they compared the TCO (total cost of ownership) for providing conferencing services for a 5,000 person enterprise requiring voice, video,and web conferencing capabilities:

Hosted 3rd party solutions - separately purchased - TCO per year per user - $1,188.47

Hosted 3rd Party solutions  - integrated - TCO per year per user - $54.47

Premised based - Complete UC solution - TCO per year per user - $88.07

Premise based - Allocation of Conferencing portion of UC Solution (33% -  assuming that you did not purchase the full UC solution solely for conferencing) - per year per user - $29.33

Please note - If you already own the licensing this significantly reduces the cost and ROI from the above,

To see the full white paper