Macular telangiectasia (MacTel) type 2 is an eye disease affecting the macula that causes loss of central vision. In this disease, the tiny blood vessels (capillaries) around the fovea, an area in the center of the macula where eyesight is the sharpest, widen and leak. 

The Internet phone, also known as a broadband phone, is a digital communications device used for making phone calls via the Internet. It is also a commonly used Voice over Internet Protocol (VoIP) application device. An Internet phone is also known as a broadband phone or IP phone. VoIP phones use many protocols like Session Initiation Protocol (SIP), the Skinny Client Control Protocol (SCCP), and various other protocols. There are even proprietary protocols such as the one used by Skype.

Other VoIP providers may use one or more protocols, plus some that they have developed on their own. The first Internet phone was developed by Vocal Tech Communications Ltd. Voice over Internet Protocol refers to the standards that facilitate voice-based phone calls using an internet connection instead of a local telephone company.

Voice over IP converts your voice into a digital signal, compresses it, and sends it over the internet. A VoIP service provider sets up the call between all participants. On the receiving end, the digital data is then uncompressed into the sound that you hear through your handset or speakerphone.

People opt for VoIP because they can make phone calls without any telephone service, which saves them long-distance charges. If you have internet access, you don’t need to run any extra copper wires. This lets employees work from home or telecommute to the office as well. To call someone using VoIP, you need a SIP-compatible desk phone or a VoIP calling app, which means it is assigned an IP address so that calls can be made from your network. Unlike landline phones, they are capable of high-definition (HD) phone calls.

The business phone is a system where multiple telephones are used by businesses in an interconnected fashion that allows for features such as call handling and transferring, conference calling, call metering and accounting, private and shared voice message boxes, etc. A business telephone system can range from just a few phones in a small business up to a complex private branch exchange (PBX) system utilized by large businesses.

Business phone systems can function over the Public Switched Telephone Network (PSTN) and/or over the Internet (Internet telephony or VoIP). Business telephone systems can also be delivered as a hosted service (typically referred to as a centrex), which can free companies from having to invest in costly equipment. Choosing a business phone system is very different from choosing a phone for home or personal use. When looking for a large, medium, or small business phone system you’ll discover many options, and a myriad of operating systems, so it helps to know exactly what you’re looking for. Of these three major business phone system options, Key System Units, or KSU, is the most basic. This makes it particularly suitable for smaller businesses, or those operating on a tight budget, but it does mean that it lacks some more advanced features.