IP Telephony Solutions

IP Telephony is the transport of phone calls through the Internet. IP Telephony services are available between computers and telephones. PC-to-PC is suitable for users who already have Internet access and an audio-equipped computer. Software is available for free. Integration with Internet services such as instant messaging and e-mail are provided. PC to telephone uses a gateway for call conversion from digital to analog and analog to digital.

Telephone-to-telephone requires two gateways, GSTN-to-Internet, and Internet-to-GSTN. IP Telephony services are either network-centric or end-system-centric. Mobility features are included in IP Telephony. IP Telephony services use either VoIP or SIP based services. VoIP systems are more popular, and their applications are generally used with a simple microphone and computer speakers. However, IP telephones or VoIP boxes can also be used. In recent years, the quality and reliability of VoIP technology has improved to a great extent, and a vast number of users are opting for VoIP based telephone systems.

IP telephony applications require firewalls to pass their Real Time Transport Protocol (RTP) streams. SIP technology has a better mechanism to tackle this problem. SIP server can act as a registrar, proxy or redirect server. It features an application-server interface, presence support, SMS gateway, simplified accounting and authorization and server status monitoring. Linux based SIP software supports numerous codes and phonebook.