Hi ajay aggarwal,
Call Flow – If it is voice call then read about C7-ISUP Protocal Messages IAM,ACM,ANM,REL,RLC.
How to configure C7 Link – More depends upon the Type of Switch/Equipment you have.But some common things…Signaling Poin Code-SPC(OPC & DPC ),Signaling Link Code…and the Hardware defintions in your Equipment.
Rgds
Scot