iPhone news

The promising future prospects of Voice over Internet Protocol (VoIP) has led to consistent and perpetual improvisation in the concept and technology of Internet Phones or iPhones, for the convenience of the Internet users and to match their preferences.

Voice-over-IP (VoIP) implementations give us a taste of luxury and economy hand in hand, as they carry voice traffic viz. telephone calls and faxes over an IP network. The ever–growing popularity of VoIP can be easily explained by the utilities on offer. VoIP not only offers low cost phone calls, but also provides add on services and unified messaging that merge data and voice infrastructures.  A VoIP system comprises of Gateway/Media Gateway, Gatekeeper, Call agent, Media Gateway Controller, Signaling Gateway and a Call manager.

VoIP communicates with an array of networks for transmitting multimedia messages like voice, video, fax and data, using Internet Protocols. One of the widely implemented protocols is SIP (Session Initiation Protocol) - a textual client-server base protocol that uses a simple protocol structure to provide the market with fast operation, flexibility, scalability and multi-service support.

Designed as a part of the overall IETF multimedia data, SIP controls architecture currently incorporating protocols such as RSVP, RTP RTSP, SAP and SDP, and yet the functionality and operation of SIP is independent of these protocols. SIP creates, modifies and terminates sessions that include Internet multimedia conferences, Internet telephone calls and multimedia distribution.

The name mapping and redirection services supported by SIP facilitate implementation of ISDN and intelligent Network telephony subscriber services. In turn, SIP facilitates personal mobility that uses a unique personal identity.  SIP is not restricted to any specific conference protocol. SIP can be conveniently used by the Internet telephony gateways that connect to Public Switched Telephone Network (PSTN) parties to set up calls.

To elaborate the functionality of SIP, callers and the called participants are identified by their SIP addresses when making a SIP call. The caller first locates the appropriate server and then sends a SIP request. SIP in turn steers an invitation, which is also the most common SIP operation. SIP request can be redirected or even used for triggering on a chain of new SIP requests by proxies. SIP messages can be transmitted using both TCP and UDP.

Recently, Linksys - a division of Cisco Systems, has unveiled the iPhone voice solutions and products that include the WIP330 iPhone. Wireless-G IP Phone or WIP330 is integrated in the SIP VoIP protocol to offer users to access music, photos, and streaming video from sources on the Internet so that they combine the product with wireless video cameras like the Linksys Wireless-G Compact Video Camera (WVC54GC), to create a home monitoring solution.