The phone system doesn't come into play until after you login, select the PBX connection, and then press the connect button. Just logging into eManager doesn't require a phone system yet. I have probably 10-15 PBX connections on my laptop and 30+ on an office PC (for dial-up).

I have run into this SQL issue a couple times, but I have always been able to resolve it with an uninstall and clean re-install.