DHCP and ip assignment with VoiP

view story

http://serverfault.com – We just added a Cisco SPA122 ATA with Router to our network, it will be used for our paging system (an amplifier/speakers). We are having a hard time getting it work. Well until we found out the ip that the Cisco SPA was using was also using the same ip as one of our servers. Now, is this something that can be fixed via our DHCP server? Or is this a problem with the Cisco SPA? It is a router with DHCP server/client. Would this be considered a rogue dhcp server? And could this cause more problems for our network? Our network uses 192.168.1.x btw (HowTos)