Softphones such as LINPHONE are usually configured on the client; however, BRIA 3.x softphone can be configured on the sipXcom server. Details of configuring LINPHONE are provided in the soft phone configuration below. Please see following link for Bria configuration: http://wiki.sipfoundry.org/display/sipXcom/Basic+Bria+Configuration+with+sipXcom+4.6
Hard phones such as Polycom are usually managed by the sipXcom server which sends profiles to the hard phones including boot rom, sip image and line configuration. Many hard phones may be initialed configured with sipXcom auto provisioning or may be manually provisioned.
In either case, if a phone is not configured by sipXcom then it does NOT need a phone entry (as in the example of LINPHONE below)
An open source SIP soft phone, LINPHONE for Windows, MAC OSX and Linux can be downloaded from: