Push To Talk (PoC)

Push-to-Talk over Cellular (PoC) is a new way to communicate via mobile phone within or between one or several groups. The application enables the group to use their mobile phones in a way similar to using a walkie-talkie.

A group can be either a local taxi company or a group of friends on a trip to Las Vegas. The groups can be established from web-tool (pre-defined groups) or from mobile terminal by using so called ad-hoc groups. The user can participate in several groups, but only one group can be a default group for speech. In essence, this means that you can listen to several different channels, but are only able to speak to one.

PoC is an important application for security and transport business and for all other situations that require fast group communication

In PoC the key-advantage over a standard cellular phone call is a quick call-setup and easy dial. By pressing a button on the phone, everyone in a group, formed by the user, can hear the talker simultaneously and immediately, without having to hit the answer-button.

Voice messaging between groups and individuals is the most obvious application for PoC, but this new feature can also be used to trigger any audio, video and text content.

PoC calls are transported over data connections, instead of a circuit switched network. All data-packets are routed through PDSN/GGSN to PoC server, which then decides where to forward the data stream. Because PoC only uses data transport, normal phone calls come through regardless of PoC status.

PoC

Current SIP-based PoC-terminals for GPRS networks use Adaptive-MultiRate (AMR) audio coding schema in 5.15kbits/s mode. This bit rate in a single GPRS time slot, causing nearly 8kbits/s of data volume for the active channel.

The Wireless ZT PoC system supports all available ways of charging and billing and the system can be customized based on the operators' needs.

Wireless ZT offers a cost effective starter kit for the operator to start testing the PoC system without having to invest large amounts of money.

Key-features:

  • Runs on Linux OS and Intel based HW.
  • Flexible billing interfaces.
  • Highly Customizable end user interface.
  • High Availability support.
  • OMA and IS Group compliant.
  • Support for Nokia native PoC client