I'm pretty sure that as long as it is a SIP (firmware) set, you should have no problem. A simple set, not a lot of options, has an even greater chance of working with any SIP server. Basic sets usually only require 3 things to get dialtone...Server address, User name (phone number), and Password.
http://www.cisco.com/en/US/docs/voice_ip_comm/csbpipp/ip_phones/administration/guide/spa_9X1_admin.pdf