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  What Are Some disadvantages of VoIP? If you're considering replacing your traditional telephone service with Internet Voice, there are some possible differences: Some Internet Voice services don't work during power outages and the service provider may not offer backup power; It may be difficult for some Internet Voice services to seamlessly connect with the 911 dispatch center or identify the location of Internet Voice 911 callers.See also IP PBX Phone System ,Asterisk PABX,Gateway phone appliance, VoIP Phone Systems for Small Business. Asterisk is an open source IP PABX that runs on the Linux operating system. It is an extremely powerful product capable of the most advanced PABX functions including voice-mail, conference calls, trunking, hunt groups, and much more.  

  What Are Some Advantages of VoIP? Because Internet Voice is digital, it may offer features and services that are not available with a traditional phone. If you have a broadband internet connection, you need not maintain and pay the additional cost for a line just to make telephone calls. With many Internet Voice plans you can talk for as long as you want with any person in the world (the requirement is that the other person has an Internet connection).  You can also talk with many people at the same time without any additional cost. IP PBX Asterisk , Voice over Internet Protocol, also called VoIP, IP Telephony , Internet telephony, Broadband telephony, Broadband Phone and Voice over Broadband is the routing of voice conversations over the Internet or through any other IP-based network.