But it can also handle other functions, including session setup (initiating a call at the target endpoint—the phone you're calling), presence management (giving an indicator of whether a user is "available," "away," etc.), location management (target registration), call monitoring, and more. Despite all that capability, SIP is simple compared to other VoIP protocols primarily because it's text-based and built on an easy request/response model that's similar in many ways to both HTTP and SMTP. Yet, it's still capable of handling the most complex operations performed by business-grade PBXes.
After all, a professional voicemail recording boosts your credibility, makes you seem more competent, and encourages whoever's listening to it to continue the relationship.

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A landline-based business phone system is fixed to your location and severely hinders your ability to communicate, whereas a VOIP line can allow you to communicate like you are sitting right beside your desk phone, wherever you may be. As long as you have an Internet connection, your business is connected. The increased mobility is one of the top reasons many business owners choose to switch to a VOIP provider.