The problem there is that VoIP traffic is much more sensitive to network bumps and potholes than most general office traffic. That translates to garbled conversations, difficulty connecting over Wi-Fi, or (worst case) dropped and lost calls. If your business is small and your network is essentially contained in one or two wireless routers, then your configuration and testing headaches might be fairly easy (though still there). For medium and larger networks, these tasks can be complex and time-consuming, which translates into added cost in terms of man-hours.
System complexity: Some businesses we speak with tell us they're replacing their existing phone system because it's too complicated and not user-friendly. Buying an overly complex system can be as bad as buying one that has too few features. Apart from paying for features that won't be used, advanced systems can present usability issues.

All plans include features like domestic calling, an auto-attendant, voicemail, voicemail to email transcription, faxing, call forwarding, toll-free numbers, vanity numbers, custom greeting, and SMS messaging.
This could be voice, email, chat or social media. Additionally, embedded communications create contextually relevant interactions to keep customers happy, improve sales and streamline customer service.