However, while understanding the basics of VoIP and SIP is important, setting one of these systems up will require some general network skills, too. For the best voice quality, your network will need to meet certain minimums levels of throughput for upstream and downstream data. In addition, you'll also need to meet a minimum latency number (that is, the time between when a signal leaves a remote computer and when your system receives it), typically measured in milliseconds. You'll also need a business-grade connection to the Internet if that's where your call traffic is going to go.
A local DID number may be forwarded by our infrastructure to landline or mobile phones or a VOIP Provider.

There are three pricing plans available at Grasshopper – Solo, Partner, and Small Business. All of these plans have all of the aforementioned features. They differ only in the number of phone numbers and extensions included. Grasshopper presents a pretty easy way to get a cheap virtual phone number.
eVoice pairs integrated fax abilities with virtual phone number services. Users also benefit from an auto attendant, the ability to forward calls, the ability to block calls, and text capabilities. eVoice offers an affordable option to customers who prefer to send and receive important information by fax instead of email.