[Serusers] SER or OpenSER

[Chahn John Kim]

I am a SER starter.
I have seen many subjects related to Openser.

Can someone shed a light on what are the differences between these?
And even some insights to suggest which may be better than the other?

We are planing to start business service shortly and we appreciate any
inputs on which SIP server infrastructure provides better performance and
scalability.

Thank you in advance.

John K.