Self-Hosted SMS gateway

Hello All,

I have been tasked with creating a design proposal that reviews multiple SMS gateway solutions. I am required to look at least 2 self hosted options and 2 managed service solutions. So far I have found:

- PageGate ( self hosted solution 1)

- PagerDuty (paid hosted solution 1)

- Clickatell (paid hosted solution 2)

I am still looking for another software solution similar to PageGate that we can host in our DC. I'm having trouble finding anything good though. Our main use case is to receive solarwinds alerts via SMS. Email to SMS is not an option as the boss is against it.

Any ideas?