It really depends on what types of conferences they want to hold. Audio only, document sharing or full interactive video are some of the choices.

We have an internal 50-port conference bridge that handles the bulk of our audio calls. AT&T Connect is used for large audio calls and document sharing. WebEx is used for fully interactive calls.

There are some really good services and crappy ones as well. If they want true business class service, I’d start with the carrier and see what can be bundled with their existing voice services.