Dialer
Server that places calls or receives calls. Usually each dialer Server can handle around 100 channels (about 4 T1s), in some situations a bit more or less. For some scenarios we can do dialer with more channels (8 or 12 T1s in a Server are possible) they are however usually more expensive then getting 2 or 3 servers due to exponentially higher hardware requirements.
We usually use Sangoma Cards for our servers, but you can also use Digium cards.