I have a new install IP Office R9. I set up the IP Office in our office so I could get the firmware upgrade completed on the phones. I had no problem connecting to the IP Office. I installed the equipment at the customer site and connected to their Cisco SG 500. The phones cannot find the call server. It retrieves the router ip address and gets assigned an IP address but just can't find the switch. Anyone familiar with setting up the Cisco SG 500 to work with IP Office 9608 IP phones? The IT tech is asking what settings need to be in their network. Any assistance is appreciated.