The following invitations have been issued:

CL-25/56: ITU Member States and Sector Members
CL-26/13: Ministers of ITU Member States
CL-26/14: Regulators of ITU Member States
CL-26/15: CEOs of ITU Sector Members
CL-26/16: United Nations and its specialized agencies, International Atomic Energy Agency and ITU Academia Members

Additionally, an letter on the update on preparations for WTPF-26 and the Strategic Dialogue was issued in CL-26/9, and an invitation to nominate Chairs and Vice-Chairs of the Forum was issued in CL-26/7.