Enables telomeric DNA binding activity. Involved in positive regulation of I-kappaB kinase/NF-kappaB signaling; regulation of nucleobase-containing compound metabolic process; and telomere maintenance via telomere lengthening. Located in chromosome, telomeric region; cytoplasm; and nucleus. Is expressed in embryo. Orthologous to human TERF2IP (TERF2 interacting protein). [provided by Alliance of Genome Resources, Apr 2022]