Techniques for setting up calls between two or more parties are described. A scheduler, operating in combination with a telecommunications network, may set up calls between two or more parties based on a queue of prioritized and/or communication mode required requests. The calls may be set up when all of the required parties are deemed to be available, based on prior scheduled events, and/or based on presence information. In one embodiment, available modes of communication, such as text, audio, data, video, of each party may be considered based on requested parameters for the call.