Business VOIP for 8 Outgoing Simultaneous Calls

[UrOnline]

Hi. If someone can point me in the right direction, I would greatly appreciate it.

I have a 2 month per year need for people to be able to make approximately 8 outgoing calls simultaneously.

I am looking for a provider that would allow an unlimited amount of outgoing calls for business use at a fixed price. Incoming calls are not needed.

I have the Obi508vs.

Any advice is appreciated.