1 Click to edit Master title style Powered by Insert Logo Here In Master Slide Phone Systems 1

2 Click to edit Master title style Powered by Insert Logo Here In Master Slide Powered by Phone System Overview Digital Key System Internet Protocol (IB) Private Branch Exchange (PBX) Hosted IP PBX 2

3 Click to edit Master title style Powered by Insert Logo Here In Master Slide Powered by Digital Key Systems Allows sharing of voice lines, placing calls on hold, and intercom calling between employees. Typical profile: Up to 30 users Single office location Voice lines shared among users 3

4 Click to edit Master title style Powered by Insert Logo Here In Master Slide Powered by IP PBX For mid-sized, or enterprise customers. Want more complex calling patterns or have inbound calls directed to agents for sales or customer service. Typical profile and product features: Support from 25 to 500 users Direct in dial for individual extensions Contact centers and/or automatic call distributer 4

5 Click to edit Master title style Powered by Insert Logo Here In Master Slide Powered by Hosted IP PBX For small to mid-sized businesses who need a scalable solution. Product features: Web-based phone system management Support sales and road warriors with mobility features for managing inbound calls Bundled desk phone and usage plans Presence management 5

6 Click to edit Master title style Powered by Insert Logo Here In Master Slide Powered by Phone System Vendors CornerStone partners with the following phone system vendors: Samsung ESI Aastra 6