M2 is a class 4 softswitch dedicated to manage VoIP wholesale business (traffic exchange, VoIP transit, IP to IP interconnections, etc.).
It is an easy to use all-in-one solution for wholesale providers that want to get the daily job done fast.
System scales up to 2000 concurrent calls per server. For bigger capacity you need a multi-server deployment.
More technical details about M2 can be found here.
Kolmisoft offers you three different ways to try M2 Softswitch according your particular needs and set goals.