EXHIBIT A AGREEMENT OF JOINT FILING Pursuant to Rule 13d-1(k)(1), we, the undersigned, hereby agree that the attached Schedule 13D is filed on behalf of each of us. Dated: January 7, 2002 COLUMBIA CAPITAL EQUITY PARTNERS III (QP), L.P.Agreement • January 7th, 2002 • Columbia Capital LLC
Contract Type FiledJanuary 7th, 2002 Company
WITNESSETH:Stockholders Agreement • January 7th, 2002 • Columbia Capital LLC • Delaware
Contract Type FiledJanuary 7th, 2002 Company Jurisdiction
SERIES Y PREFERRED STOCK PURCHASE AGREEMENT DECEMBER 24, 2001 TABLE OF CONTENTSPreferred Stock Purchase Agreement • January 7th, 2002 • Columbia Capital LLC • Connecticut
Contract Type FiledJanuary 7th, 2002 Company Jurisdiction
Exhibit E VOTING AGREEMENTVoting Agreement • January 7th, 2002 • Columbia Capital LLC • Delaware
Contract Type FiledJanuary 7th, 2002 Company Jurisdiction