What are VoIP advantages and disadvantages?
VoIP is a new communication technology which uses legacy IP network for voice and other multimedia services. Service providers offer VoIP services via SIP trunk. Like many other technologies, it brings some advantages and disadvantages. We have already discussed in the previous post about the VoIP call. In this tutorial, we will discuss the VoIP advantages and disadvantages in detail with examples.
VoIP Advantages :
Here are describing the advantages of the VOIP over the legacy telephone system. Each section has a detail explanation alone with a suitable example. The advantages do not limit to the ones mentioned here, there can be more. But these are the major ones.
The most important thing in any communication network is the coverage. Coverage means, geographical area covered. If a network is very strong but provides coverage only in a limited area, is not good for the service provider or end-user. PSTN covers only the areas that are covered by a telecom operator over wireless channels or via telephone lines. VOIP has an advantage, that it can work over a telephone network internet connection and also on other internet provider networks. E.g a good broadband IP network can bring extra coverage alone with telephone company coverage. Mobile operators also realize the advantages of VoIP by using an internet connection option for the services. This leads to the service like Wifi Calling, femtocell, and picocell. These uses in house radio channels and telephone towers.
For a caller, the cost matters a lot. These days cost for local calls and national roaming has been reduced significantly. Almost all mobile operators offering a fix price plan for unlimited voice calls and SMS within a country. But when it comes to international calling or roaming. The cost is still significant. VoIP provides a cost advantage. Event few VoIP companies e.g skype provide free VoIP to VoIP calling via mobile or web app. They also provide calling from VoIP phone to any other GSM mobile number. This adds some cost but still, you may find cheaper than normal GSM to GSM international calls. Along with this calling card is also a good example. Where call rate is local with some amount from calling cards.
Initial Setup Cost:
The mobile network setup costs to the companies those providing voice services. When they need to give a PSTN connection, there should be a line from the local telephone exchange to the subscriber’s home or office. VoIP uses an already deployed internet connection. In the case of VoIP initial setup cost is almost zero for network infrastructure. Only the cost will be of the handset (if not a mobile app you are using) and a top-up from the VoIP service provider.
Redundancy or High Availability:
Mobile or a PSTN phone connects to a single point of connection to the telecom operator. The single point of connection is the local telephone exchange. Imagine, if telephone exchange got the power failure for a significant period of time. During that there will not be any service. Here VoIP has an advantage of redundancy. Redundancy means multiple points of contact. There can be multiple VoIP back-end servers located at various far places. If one can not serve, others can provide services. VoIP phones have the server name as a URL (e.g www.voipprovide.com) in VoIP provider or server configuration. The URL points to a VoIP server IP by doing a DNS lookup. When a server fails (to which URL was pointing ), only DNS entry needs to be updated to the new VoIP server. This way VoIP service will continue, in case of failure.
The capacity refers to the amount of data a network can carry. The traditional phone lines are copper wires and have a fixed capacity. While the internet is moving towards much more faster communication channels. For example, many internet providers are providing fiber optics for connectivity. This enables good quality voice and video calls.
The above section explains about the VoIP advantages. Now there are a few disadvantages also. The following mentions the disadvantages for the VoIP.
No Dedicated Bandwidth:
Although the internet has a high bandwidth. But it is a shared packet-based network. This is a disadvantage for VoIP. There is no way to give a dedicated speed to the VoIP. This may result in a poor quality of calls. For example, you might experience that sometimes, VoIP call quality is good, and sometimes not. It is not only your internet connection speed which decides the call quality. But also the available bandwidth on intermediate network routers/switches and other connectives.
For example, if you are making a VoIP call from India to Austria, with a good quality of internet speed. But the link to the internet between India and Austria is poor. In that case, the call quality will be poor. This concludes that the internet speed should be good at each and every hope from calling to called.
The PSTN contrast to this, when there is a call, a dedicated channel (TDM Trunk E1/T1) is reserved for the call only. Make a guaranteed quality of service.
A VoIP call does not route all the way over the VoIP provider network only. It also uses public internet connection one the way. This is a disadvantage for security in general. The local government body can not trace the VoIP call. While PSTN calls are always via telecom operators, so the call can be traced.
Special Software’s are required:
By default, mobile devices or PCs don’t have support for VOIP. A user has to install a third-party application. This application may lead to a security threat, as it has access to the device data. With the LTE, there are features e.g WiFi Calling. But still, it is not supported by all mobile operators. So before using a VoIP client, choose a trusted service provider.