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I guess the first one that comes to mind would be Twilio.

Yup, Twilio + OpenVBX is pretty nice.

Disclosure: I work at Phonebooth.

I'd encourage you to check out Phonebooth.com. We have our own network and are well positioned to meet most SMB business phone needs.

If you are looking to make the jump, email us at marketing@phonebooth.com and we'll be able to work something out for you to make an easy switch.

Thanks, Chris Moody

Disclosure #2: I work at Phonebooth and this is not some clever ploy.

I don't have any affiliation. other than a direct customer relationship, but I use flowroute dot com for wholesale SIP termination.

EDIT: I should probably mention that we run freeswitch[1] on a 4 yr old box on our LAN.

[1] freeswitch.org

RingCentral is pretty solid. The web interface is bad but the service itself is solid, good feature set and reliability.

We use five9, but they have downtime as well (they are hosted call center, not SIP). Super easy to use, expensive.

Tried to get a quote from liveops, but they literally won't call back. Terrible sales staff.