Hello, I have a CTG GK-308 and a GK-816 here, I use yhe GK-308 but I will use my GK-816 (recently acquired a lot of tel sets) I purchased my gk308 in 1995 and never see anywhere an user/inatall/maint manual for this ksu, is a black case KSU, with CTG in grey on the face, but this made by VODAVI...
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