17 C.F.R. § 260.10a-4
At the time of filing an application pursuant to Rule 10a-1 (§ 260.10a-1 of this chapter) and at such time as it files a statement of eligibility to act as trustee under an indenture qualified under the Act, an indenture trustee organized and doing business under the laws of a foreign government shall furnish to the Commission on Form F-X (§ 249.250 of this chapter) a written consent of the trustee and power of attorney designating a U. S. person with an address in the United States as agent upon whom may be served any process, pleadings, subpoenas or other papers in any Commission investigation or administrative proceeding and any civil suit or action brought against the trustee or to which the trustee has been joined as defendant or respondent, in any appropriate court in any place subject to the jurisdiction of any state or of the United States, or of the District of Columbia or Puerto Rico, where the investigation, proceeding or cause of action arises out of or relates to or concerns the securities in relation to which the indenture trustee proposes to act as trustee pursuant to any rule or order under section 310(a) of the Act and stipulates and agrees that any such suit, action or proceeding may be commenced by the service of process upon said agent for service of process, and that such service shall be taken and held in all courts to be as valid and binding as if due personal service thereof had been made.
17 C.F.R. §260.10a-4