In VoIP context, before viber server sends the signalling (Probably SIP) it sends a push alert to launch the application and sends SIP invite to initiate a call. It’s kind of, viber server sends push alert to viber application when a call is received. (3) The main difference in Viber is, you don’t need to run the viber application to receive calls whereas when you receive a call it launches the application and rings. Where as in Viber, it currently supports for iPhone only and promising to release Android and Blackberry versions soon. (2) Skype Client Software could be installed on any compatible device and same username password pair can be used to login and make calls. (1) Skype has video calling where as Viber at the moment doesn’t have video calling. Skype offers free voice and video calls between Skype users, call any phone numbers in the world by charging on per minute rate and connection fees (Skype Out), sending SMS, Chat, file sharing, call conferencing, call forwarding, providing local phone numbers worldwide (at the moment 24 countries only) to receive calls to Skype software (Skype In) and Skype to Go Number to access Skype Out services where ever you go. Skype is an application software which works as VoIP (Voice over IP Protocol) client to originate or receive voice and video calls. Android Viber will also have the same features as described. Viber for Android is released in early May as Beta Version. On the other hand it has disadvantages too. Only considerable advantage on Viber is, it’s synchronized with iphone’s phone book contacts and uses your mobile number as username. Then you can call them for free but it will use your data plan.Viber users could be anywhere in the world if they are connected to internet. This application uses the same address book in your iphone and show a tag against contacts if they are registered viber users. One good thing on this application is, instead of going through registration, it uses your mobile number as username and registers automatically and will drop a verification code to confirm your number. At the moment iPhone users can download viber from apple store and install on their iphones.

Viber is an iPhone application that allows you to make free calls to users who have viber installed on their iphones. Viber and skype are VoIP applications used in mobile Internet calling.Viber and Skype are free between users where viber can only be installed in mobiles but skype can be installed in PCs, Laptops, Notebooks, Smartphones, Skype Phones, Mobile handsets and in mostly other desktop devices.

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