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. 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