IP telephony is the transport of telephone calls over the Internet. IP telephony services are available between computers and telephones. Since PC-to-PC is suitable for users who already have Internet access, audio-equipped computer. The software is available free of charge. Integration with Internet-based services, such as instant messaging and e-mail are provided. PC to the phone uses a gateway to call the transition from analog to digital and analog to digital.
phone connection requires two locks, GSTN on the Internet and Internet-on-GSTN. IP Telephony Services, a network-centric or end-system-centric. Mobility features included in the IP telephony. IP Telephony Services to use either or VoIP services based on SIP. VoIP systems are more popular, and their applications are typically used with a simple microphone and computer speakers. However, IP phones or VoIP boxes can also be used. In recent years, the quality and reliability of VoIP technology has improved to a great extent, and the vast number of choices for users based VoIP telephone systems.
IP telephony require the use of firewalls to submit their real-time Transport Protocol (RTP) streams. SIP technology is better mechanism to address the problem. SIP server can act as a registrar, or proxy server redirect. It includes application-server interface, the availability of support, SMS Gateway, simplified accounting and authorization and monitoring of the server. Linux software on the basis of SIP supports numerous codes and phone book.
Traditional telecommunications operators have been providing special services to the floor using the existing infrastructure that has been achieved in intelligent networking architecture. In IP telephony, router congestion is the main factor that hinders, as the sound quality is not on par with PSTN services. Quality wise, IP telephony services have not yet match their counterparts PSTN.
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