Change of proxy IP address (End Office Tandem)

My far end tandem office wants to change their IP, and I need to modify my SBC config to match.

Can you describe the steps I need to take to change this?
Cust IP is my SBC, IQ IP is far end. I am assuming I do not need to do anything with the new RTP port range as this info is negotiated? Would that be true?

Thanks!