We have a Mitel 5000 system and use VOip/POE. We have two working Netgear gs748tp 48-port gigabit POE switches that all our phones plug into. We are trying to add a Cisco SG500-52p POE switch to add more phones. When we plug our phones into this Cisco switch it does power on but it says contacting DHCP server. When I plug a laptop into the Cisco switch I get an ip address, I have Internet and I can ping across all our networks (192 and 172 networks).
On one of our Netgear switches, ports 1 & 2 are on VLAN 10 (192.168.170.0 network). Port 1 connects to our Mitel phone system and Port 2 connects to our Sonicwall firewall. The rest of the ports are on VLAN 1 (172.16.202.0 network).
I haven't configured anything on my Cisco switch yet. What do I need to do? Why can't my Mitel phone get an ip address?