Section 18U. Sections 16 to 28, inclusive, of chapter 44 shall apply to regional 911 emergency communication districts. Section 16 of said chapter 44, relative to the countersigning of bonds and notes, and section 24 of said chapter 44, relative to the countersigning and approval of notes and the certificates of the clerk relating thereto, shall not apply to regional 911 emergency communication districts. Any debt incurred by a regional 911 emergency communication district shall not be subject to the limit of indebtedness prescribed in section 10 of said chapter 44.