Section 65.100 - Participation and acceptance of service designation(a) All interstate exchange access carriers, their customers, and any member of the public may participate in rate of return proceedings to determine the authorized unitary interstate exchange access or individual interstate exchange access rates of return authorized pursuant to § 65.102 .(b) Participants shall state in their initial pleading in a prescription proceeding whether they wish to receive service of documents and other material filed in the proceeding. Participants that wish to receive service by hand on the filing dates when so required by this part 65 shall specify in their initial pleading in a prescription proceeding, as specified in § 65.103 (b) and (c) , an agent for acceptance of service by hand in the District of Columbia. The participant may elect in its pleading to receive service by mail or upon an agent at another location. When such an election is made, other participants need not complete service on the filing date, and requests for extension of time due to delays in completion of service will not be entertained.60 FR 28544, June 1, 1995