There are no special parameters you need to set in order for IP phone services to work with an Apache web server, as a matter of fact, Apache works quite well for this purpose.
The major issue is that you need to have the pages requested by the IP phone be tagged with XML that the phone is able to understand. This is independent of the web server.
http://www.cisco.com/univercd/cc/td/doc/product/voice/vpdd/cdd/3_1/ipphsrvs.htm
