GNU General Public License is a free software licence.This is the most widely used licence throught the world.Percentage of using this licence is 25% which is greater than any other open source licence.This licence provide their user freedom to use,share and modify the software.The software which provides these types of freedom is called free software.The user of this licence are individual organizations and companies all over the world.Very important aspect of this software licence is that it provide freedom to their user to cooperate.It allow the user to share their thoughts for fixing bugs and increase the functionality of software.
The Session Initiation Protocol (SIP) is a communications protocol for signaling and controlling multimedia communication sessions in applications of Internet telephony for voice and video calls, in private IP telephone systems, as well as in instant messaging over Internet Protocol (IP) networks.
The protocol defines the methodology of SIP communications and the specific format of messages exchanged for cooperation of the participants in multimedia sessions. SIP is designed to be independent of the underlying transport layer protocol, and can be used with the User Datagram Protocol (UDP), the Transmission Control Protocol (TCP), and the Stream Control Transmission Protocol (SCTP). It is a text-based protocol, incorporating many elements of the Hypertext Transfer Protocol (HTTP) and the Simple Mail Transfer Protocol (SMTP).
In this article we discussed top five open source sip libraries that developers / programmers can use to develop sip based applications .
Ubuntu is a free and open source Operating System platform based on Linux Kernel. This Operating System is very easy to use and understand.Ubuntu provide free security updates. By default Ubuntu Operating System included many software like Firefox, Games, LibreOffice, Transmission and Thunderbird. It is develop on Debian's architecture and is available for different platform like Desktop, tablet, phone.
ERP(Enterprise Resource Planning) is a management software system for business. This software allow their user to automate and integrate their business application. Through ERP organizations manage easily different functions which belong to services,human resource, technology etc. ERP allow you to integrate Multiple operations of business which perform different departments like development,planning,manufacturing,marketing,sales,Shipping and payment etc.
Call center center software is used to deliver and receive large number of telephone calls by agent.The work of agent is to guide the customer about specific product or services.Call center software mostly support inbound and outbound campaign.Large number of Open Source Call Center software are developed by Open Source Community.Lets we see some of the top two Open Source Call Center Software.
PBX(Private Branch Exchange) is a small telephony system. PBX provide the ease for enterprise to build the internal telephone connection for the enterprise users. It also allow the user to share a specific number for external phone lines. The basic purpose of PBX is to save the communication cost in enterprise. Instead of using separate telephone lines for each employes by using you can share one line with number of employes.