Voice over Internet Protocol, or VoIP, architecture consists of end-user devices, gateways, gatekeepers and the IP network˳ The software for VoIP is a collection of programs, applications and protocols to manage the architecture˳ The significance of VoIP software is underlined by the increasing demand for higher quality of service from consumers˳ Effective software programming translates into effective management of calls–in terms of routing of the calls through the least congested paths–and clarity of voice˳
VoIP software can be classified according to the different functionalities in the VoIP network˳ These functionalities include the management of user interfaces, call processing, network management and billing˳ User interface software handles the interface to the user of IP telephone˳ The important features of the user interface include algorithms to compress voice data, echo cancellation and encryption˳
Call processing servers are run by software to map the destination of the call˳ The software is a database program called soft switch˳ The software translates the phone number into a unique IP address after checking the validity of the number˳ It connects the two devices on both ends, after alerting the called party of the incoming call through a ring˳
Call administration software, called consoles, are applications that manage the state of the calls and the distribution˳ This software provides bandwidth management˳ Some of the standard protocols are H˳323 session initiation protocol˳ In order to maintain the quality of service, real time protocol (RTP) is employed˳ The software also manages the networks˳
Some of the customer-oriented services managed by software are billing services˳ This includes pre- and post-paid services˳ Some provide voicemail services that synthesize voice for mails˳ IP soft phones are managed by software that lets the user directly connect with the VoIP provider through a computer˳ Skype software is rapidly capturing the market with millions of phone minutes˳
Another area where software provides services is in the call-monitoring systems for call offices to manage the calls and Computer telephony Integration for businesses˳
Software development is accelerated by the need to solve various issues such as loss of packets and sequencing of packets˳
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