Those plans are far too lean.
Also, I don't understand what a "local line" is when I go directly to your pricing page. I also don't understand what a "toll free line" is. Specifically I don't know why I need 5 lines.
I don't run a pure SaaS (http://gridspy.com) but $9 / mo? These people are not employees. They have profits. We had to fight the same tendancy to offer unrealistically low prices.
Your typical "professional" will bill $80-$200 / hr while on the conference call. They'd swallow $40 +
You probably don't need a free plan, though you might want to consider a prepaid one. Bill on minutes or something. I'd consider eliminating it entirely.
Team should be about $200 and business you should be thinking $1000 / month plus.
I also think that segmenting based on max people per conference makes a lot of sense. It would also be simpler to bill based on "number of conferences" rather than "number of minutes" and trigger a new "conference" when a call extends beyond 1 hour.
Higher prices should support more marketing work. You'd be surprised - higher prices will make your clients think that your product is more valuable and thus more likely to try it out.
You've also got a viral element. Your users are telling others about you (to invite them to the conference). Ask them to put each person's phone number and email addresses into the system so you can send reminders to each participant before the meeting.
In those reminders, I suggest you offer a "coupon" for 1-5 free conference calls to that guest. You might only want to do so if the guest has an email from a different domain. Monitor for abuse. This will help you get natural viral marketing underway.
Another alternative is to build a followup email after the conference ends that has details on who joined the meeting, how long they talked, a downloadable recording (?) and their contact details.
I hope this helps. It looks like you have a nice product.
