Outbound call centre Software!!

I'm planning to start a Outbound call centre very soon. I want to create a software for that. I need a outbound call centre platform for my company. Please list out the features in software that your are developing., I will give this project to the workers who can give best features providing me. I have seen ipScape outbound call centre software. But I need a best software to use in my business. Please list out the features your gonna develop.