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Interstate Common Line Support (ICLS) is available only to rate-of-return incumbent carriers (mostly rural and some non-rural carriers) and competitive carriers providing service in the areas of these companies, which must be designated as eligible telecommunications carriers (ETCs) by their state commissions or the Federal Communications Commission (FCC).
ICLS helps to offset interstate access charges and is designed to permit each rate-of-return carrier to recover its common line revenue requirement, while ensuring that its subscriber line charges (SLCs) remain affordable to its customers.
ICLS is based on annual projected data submitted by incumbent carriers each March 31 and is subject to an annual true-up process based on actual data submitted by incumbent carriers each December 31 for the previous calendar year. Because competitive carriers receive ICLS based on the incumbent carriers' data filings, which are used to calculate per-line rates, competitive carriers do not need to file projected or true-up data for ICLS.
ICLS is covered in Subpart K of Part 54 of the FCC's rules (47 C.F.R. § 54.901 et seq.)