When Halo was being developed for initial release on the Windows and Macintosh platforms, there was speculation that it might include built-in voice communication as Marathon 2 did, or that it might be compatible with existing network voice communication software like Roger Wilco.

There are currently no indications that the Xbox release version of Halo includes any such capabilities. It is not known whether or not the Windows and Macintosh release will include such features, or be compatible with other software packages that do.