What are some disadvantages of using VoIP?

• * Some VoIP services don’t work during power outages and the service provider may not offer backup power.
• * Not all VoIP services connect directly to emergency services through 9-1-1.
• * VoIP providers may or may not offer directory assistance/white page listings.

one of the major VOIP drawbacks that can be overcome is shared medium with the data network, quality of service must be configured properly to guarantee call quality. and prevent latency and bottle necks caused by data processing and transmitting.

Support and Maintenance, maintaining Network Infrastructure as per the required Bandwidth and Technologies, Need Specialise Infrastructure engineer to Properly Configure the QOS Services.

• First of all, VoIP is dependant on wall power. Your current phone runs on phantom power that is provided over the line from the central office. Even if your power goes out, your phone (unless it is a cordless) still works. With VoIP, no power means no phone. A stable power source must be created for VoIP.
• Another consideration is that many other systems in your home may be integrated into the phone line. Digital video recorders, digital subscription TV services and home security systems all use a standard phone line to do their thing. There's currently no way to integrate these products with VoIP. The related industries are going to have to get together to make this work.
• Emergency 911 calls also become a challenge with VoIP. As stated before, VoIP uses IP-addressed phone numbers, not NANP phone numbers. There's no way to associate a geographic location with an IP address. So if the caller can't tell the 911 operator where he is located, then there's no way to know which call center to route the emergency call to and which EMS should respond. To fix this, perhaps geographical information could somehow be integrated into the packets.

VOIP Disadvantages    1- First of all, VoIP is dependent on wall power. Your current phone runs on phantom power that is provided over the line from the central office. Even if your power goes out, your phone (unless it is a cordless) still works. With VoIP, no power means no phone. A stable power source must be created for VoIP.    2- Another consideration is that many other systems in your home may be integrated into the phone line. Digital video recorders, digital subscription TV services and home security systems all use a standard phone line to do their thing. There's currently no way to integrate these products with VoIP. The related industries are going to have to get together to make this work.    3- Emergency 911 calls also become a challenge with VoIP. As stated before, VoIP uses IP-addressed phone numbers, not NANP phone numbers. There's no way to associate a geographic location with an IP address. So if the caller can't tell the 911 operator where he is located, then there's no way to know which call center to route the emergency call to and which EMS should respond. To fix this, perhaps geographical information could somehow be integrated into the packets.    4- The disadvantages of VOIP include possible echoes and unpredictable sound quality.    5- Because VoIP uses an Internet connection, it's susceptible to all the hiccups normally associated with home broadband services. All of these factors affect call quality:latency, jitter and packet loss. Phone conversations can become distorted, garbled or lost because of transmission errors. Some kind of stability in Internet data transfer needs to be guaranteed before VoIP could truly replace traditional phones    6- VoIP is susceptible to worms, viruses and hacking, although this is very rare and VoIP developers are working on VoIP encryption to counter this.    7- Another issue associated with VoIP is having a phone system dependent on individual PCs of varying specifications and power. A call can be affected by processor drain. Let's say you are chatting away on your soft-phone, and you decide to open a program that saps your processor. Quality loss will become immediately evident. In a worst case scenario, your system could crash in the middle of an important call. In VoIP, all phone calls are subject to the limitations of normal computer issues.If you are considering making a choice between VOIP and PSTN, consider a hybrid system. Keep PSTN at the periphery of this system and VOIP at the core. This will give you the best of both worlds.The near future belongs to VOIP. By migrating over to VOIP now you will not only save money but be a part of the future as well.

Price and complexity for some user to use.