Hardware
Although SIP Broker works with multiple SIP adapter brands and models, all of the SIP Broker developers personally use Sipura adapters. Also, I (voip247) think that the SPA-2100 is by far the best SIP hardware adapter, primarily because it's latest firmware has foolproof QoS, meaning that you can web browse and upload files without reducing the voice quality of your SIP phone calls. Also, the Linksys WRT-54G is a very popular home router.