[Freeswitch-users] Newbie question: plain FreeSWITCH or SIPfoundry

I work for a small service provider and would like to test how well FreeSWITCH's software works against our Nortel CS-1500 to provide conferencing services (for 5 to 100 legs). I'm not looking to provide PBX functionality. Reading through the SIPfoundry 'stuff' it appears that SIPfoundry makes it easy to configure and manage FreeSWITCH, but perhaps that would be making it more complicated than necessary. Any advice? Frank