Nokia 3555, User Manual

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Push to talk (PTT) over cellular is a two-way radio service available over a
GPRS cellular network (network service).
You can use PTT to have a conversation with one person or with a group of
people (channel) having compatible devices. While you are connected to the
PTT service, you can use the other functions of the phone.
To check availability and costs, and to subscribe to the service, contact your
network operator. Roaming services may be more limited than for normal calls.
Before you can use the PTT service, you must define the required PTT service
settings. See "PTT settings," p. 86 and "Configuration settings," p. 87.
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PTT channels
A PTT channel comprises a group of people (for example, friends or a workteam)
who joined the channel after they were invited to. When you call a channel,
all members joined to the channel hear the call simultaneously.
There are different types of PTT channels:
Public channel — Every channel member can invite other persons.
Private channel — Only persons which receive an invitation by the channel
creator can join in.
Provisioned channel — A permanent channel is created by the service provider.
You can set the status of each channel to Active or Inactive .
The number of active channels and the number of members per channel is
limited. Contact your service provider for details.
Create a channel
To add a channel, select Menu > Push to talk > Add channel and enter the
settings in the form fields: