Cisco Unified Communications 500 Series for Small Business， a critical part of the Cisco Smart Business Communications System， is a unified communications solution for small businesses that provides voice， data， voicemail. Which three features does the Cisco UC520 support？（）
- A、 distributed routing
- B、 Cisco Unity Express
- C、 security， firewall and VPN
- D、 analog devices
正确答案:B,C,D
答案解析:有
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