ESI Communications IVX 56S S-Class Generation II Digital Phone System without NSP (Refurbished)Key Features: ESI S Class Generation II All In One Digital Phone System ESI provides big system features into the small business IVX S Class The IVX phone system design means all vital business communications features are easily accessible Equipped to grow to 16 phone lines, 32 digital stations, and eight analog stations, IVX S Class gives your business a competitive edge 4 x 8 x 2 ,4 Lines 8 Extensions 2 Single Line Extensions Expanded Voicemail: S