Voip
The Disadvantages of IP Telephony
IP telephony is becoming the most popular means of telecommunication however there are certain disadvantages of VoIP: dependence on wall power, latencies, jitters and packet losses, susceptibility to viruses and hacking that can frustrate your conversation. 
The Advantages of IP Telephony
The advantages of IP telephony make it the most popular and affordable type of telecommunications – low cost calls including cheap international and long distance calls, portability (you can use the same number form anywhere in the world), extra features for free. 
How VoIP Works
VoIP is the way to transmit voice over the Internet and place low cost long distance and international calls. VoIP can be performed through VoIP phones, from computer to computer, and through ordinary phones with VoIP adapters 
Business VoIP
Business companies derive benefits from IP PBX networks: centralized management of the whole business notwithstanding the site, cheap long distance and international calls, mobility of employees, quick access to multiple VoIP services, etc. 