Exactly what is your specific application as there may be some ideas to consider.
While the IPO has conference bridge capabilities, there are considerations of routing calls to the bridge/s. When using the IPO, I have always done this in conjunction with VMPRO to provide menus, access, and control (security codes)for the bridge/s. Using the IPO without VMPRO for this is quite good, but you need to consider how you will manage the resources of the IPO, and access to the bridges.