EXHIBIT 23.1 CONSENT OF KPMG PEAT MARWICK LLP The Board of Directors VIALOG Corporation: We consent to the use of our reports included herein and to the reference to our firm under the heading "Experts" in the prospectus. /s/ KPMG Peat Marwick LLP KPMG Peat Marwick LLP Boston, Massachusetts January 8, 1998