Introduction of Skype (voice unified communication)
Skype is the most popular communication tool service in the world. The skype service comes with application software and softphone which suit the application so normally many people think that skype just only provide software which outcome the well service which they provide. The service also provide free or paid service with different kinds of program which can be use in skype as paid service include more features. The free service only provide connect with other skype users while other premium plans include the ability to call from skype to landlines across the worlds as well as own a skype dial-in number so that landline callers can reach us on your computer. Skype has cutout quite a numbers of barriers to the communication system which it is due to poor connection user for the network traffic, while in the early stage we needed to take particular care of the minutes and seconds we spend speaking on international calls which end up is overprice spending, but now we no longer need to worry about it. If you are using pc to pc chatting, you will not paying a single cent in the skype free account more than just your monthly internet service billing. Skype is using the integration of voice and instant messaging service to talk to each other which delivering clear and high quality calls over the internet. Requirement tools for using skype is simple few things, a computer with decent processing speed and memory which must have keyboard and mouse in your system, a high-end speed internet connection like boardband, sound card that speaker or earpieces is in working condition and last thing skype software which is freely downloadable in the main website. People use skype mainly for the high quality of voice it provide and also because it provide free service for pc to pc talk. We around the world use skype for several things such as long-distance communicate with family,friends and loved ones,for business calls or long-distance conferences and also cheaper calls during our traveling and ETC

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The features and strength/weaknesses of skype
Skype has a lot of interesting features which can be use like video call or conferencing, SMS, voicemail, instant messaging, call forwarding, skype to skype interface, business control panel, contacts and many others. For free plan skype only include most feature using like instant messaging and skype to skype calls through skype account but for paid plan it cover most features in free plan and plus include call phone and mobile, sending sms to other phone which can be done using either pc or softphone which usable with skype
Strength & weakness:
Nowadays, skype work in the rightness of networks and recent technology which overcome it strength and weakness. For it’s good point because it let us manage to have a lot more flexibility and more better voices which overcome the problems cause by poor call quality and other interrupting issue which cause by “noise” in the telephone line and what the weakness about skype because it stops most accounts in skype users from being able to communicate with other open source networks that dealing with communication software
And another main reason is that when you are using low-connection internet or keep receiving poor signal while in the skype conference, the application in the skype has some clever programming managing tool to analysis the problem try to prefix it and get your call smoothly through the calls. The program tool has the most important ability to dynamically change and fix in the codec in use to the call to suit the network conditions strength. Sometime we will also encounter packet loss during the sending of information which cause alot of times waiting for the busy line to be stable to send out the data to one and other using skype
The problems skype trying to address

They need to improving its identity authentication process. This is one of the part skype trying to further expansion into the business market to enhance username authentication for business customers.
Skype also encounter security bug that could expose value and useful data to hacker. Most users could let an hacker making a Skype hyperlink which the users clicked on it, it will sends a file from the victim’s computer to another Skype user.
One of the most problem they address is that hackers tend to control a user’s pc without the admin promission which cause alots of value data being known. An hacker could exploit the user pc by programming or uploading a special link and AD-popup a user to click on it. The hacker can also be exploited when sending some annoying information from a malformed electronic business card or Vcard.

Critically evaluate Skype and future trends
Scalable Skype PBX/PABX Gateways
FEATURES & BENEFITS:
Company now can talk or chat over on skype for free and Skype-Out for low-cost call without PC cause they provide Skype-In static numbers for local calls to users and Skype-Web calls for user with free plan service . Using Company’s phones to make a simple calls by prefix-handle service and smart PhoneBook . . Directly connect to PBX/PABX program using Plug & Play format which only took 10 minute, also by using the program Sky-Grid System to upgrade the total capacity storage can save more money and with the better administration & Control to make MIS/Call-Management job more easier
They also provide Solving the issues of Bandwidth & Information Security by independent xDSL and monitor the status by VNC Web-Administration or Telnet Control.
Reference from : http://eshop.spin3d.com.tw/images/Scalable%20Skype%20PBX%20Gateway.pdf
Open source freeswitch added into skype:
This is the new release device which called “freeswitch”, is the first open source freeswitch will enable user or orgamnisation to intregrate skype into their Voip and platform services. For the first time, developers will have a free usage which include high-performance voice switching platform that can tie Skype clients into nearly every other major VoIP platform on the market today. Aside which we extending high definition voice across the networks, freeswitch will enable developers to build Skype integration into telephone applications, such as VoIP-enabled IVRs. Skype upgrade not only change the platform to freeswitch but also added in support for one of the most popular telephone engines (open phone layer) which gives freeswitch support for 323 clients and devices which also brings another venue for SIP support. Skype also working towards tighter integration with the platforms, the skype for asterisk is a prototype to allows interoperability between skype and asterisk. Which offer better voice quality, allow users to place and receive calls without any cumbersome workaround, provide caller ID and retrieving skype credit balance information control panel that user can access
Reference from : http://blogs.zdnet.com/Greenfield/?p=353