ماهي خاصيةالpush to talk في نوكيا 6260

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السلام عليكم ....
ماهي خاصية الpush to talk
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[Alone the Dark]

Push to talk over Cellular (PoC) introduces a new real-time direct one-to-one and one-to-many voice communication service in the cellular network. The principle of communication behind the service is simple - just push to talk. Thanks to the 'always-on'1) connection, calls can be started to both individuals and talk groups with just a push of a key. The call connection is almost instantaneous and the receiver doesn't have to answer the call.

Push to talk service users are typically engaged in some other activity than a telephone call, and they listen to the group traffic during their activity. A user can be contacted by the name, or he may occasionally want to say something to the group. Half-duplex traffic is ideal for such use cases. This simple, real-time direct communication serves the diverse needs of both business users and private consumers ranging from controlled team management to spontaneous sharing of experiences. Among the many benefits of this solution over conventional two-way radio systems are the attractive GSM phones and the simple and fast creation of talk groups and group calls.

Push to talk service is a genuine differentiated voice service, because it is not a substitute of any existing cellular services. It gives operators an opportunity to develop their voice service offering without changing conventional voice services.

The Push to talk service is an integral part of the IP Multimedia communication portfolio envisioned by Nokia, and a part of the service offering in IP Multimedia Subsystem (IMS). It is based on half-duplex Voice over IP (VoIP) technology over the 2nd generation GSM/GPRS network. Thanks to the IP technology, the Push to talk service uses cellular access and radio resources more efficiently than circuit-switched cellular services, reserving network resources only for the duration of talk spurts instead of for an entire call session.

Nokia believes that Push to talk service must be based on open standards to enable multivendor environment and interoperability between different terminals and services. Nokia has participated in an industry initiative together with Ericsson and Siemens on the Push to talk solution and the solution will be open to other manufacturers as well. This solution offers terminal manufacturers an opportunity to implement the Push to talk facility across GSM mobile phone categories, thus giving end-users more freedom to choose the products that best meet their communication needs.

1) "Always-on" means that a subscriber has typically direct access to the service after the subscription to it without additional measures (such as dial-up) provided that cellular network supports the service, is available and is not overloaded.

Industry leaders Ericsson, Motorola, Nokia and Siemens mobile announced on September 10, 2003 the completion of a jointly developed Push to talk over Cellular (PoC) specification based on the IP Multimedia Subsystem (IMS) as defined by 3GPP.

Nokia takes initiative in Push to talk over Cellular terminal interoperability. >>
Nokia and Samsung join forces in bringing push to talk to mass market. >>
Action, not just words: Nokia introduces push to talk for active lifestyle. >>
Mobile industry leaders complete joint specification for 3GPP IMS based Push to talk over Cellular (PoC) technology. >>
Ericsson, Nokia and Siemens join forces to promote unified solution for push to talk over GPRS and EDGE networks. >>




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يرجى دخول الموقع التالي http://www.nokia.com/nokia/0,8764,46740,00.html

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