I am looking for recommendation on sip providers. We currently use Bandwidth.com with 6 lines but would like to increase our line usage and do not want to find reliable sip providers.

A couple of questions:
1)We would like to use another sip provider as backup because we had Bandwidth.com go down in the past. I was wondering if you have your main number with Bandwidth.com with hunt and they go down, what would the failover strategy be? How would you have your main number forwarded to the other provider?

2)We are mainly looking to increase our incoming lines because we are a helpdesk center. We are currently paying $30/month for unlimited at Bandwidth.com. The interesting thing is if I would go through Freepbx.com which resells bandwidth.com, we would only be paying $24.99/month for the same service. When I asked Bandwidth about it, they said they provide business class service and are monitoring it around the clock. That is an interesting selling tactics.

Thanks
-Dimitry