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IMS Call Flows > IMS PoC Call Flows
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Push-to-talk over Cellular (PoC) service
allows cell phones to used as walkie-talkies. A group of users in a PoC
session can communicate by simply pressing a button and speaking when the
phone indicates it is OK to do so. The user releases the button when he or
she is done speaking. When a user begins to speak, the PoC server allocates resources and notifies other users in the PoC session that the user is speaking. The PoC server then delivers the speech packets to all the users in the session. PoC is resource efficient as it allocates resources only when a user is actually speaking. This makes it suitable for applications where there are long gaps between individual session participants speaking.  IMS
PoC Registration and Pre-establishment
pdf
IMS
PoC Pre-established Push to Talk Call Flow
pdf
IMS
Pre-established PoC Call Poster (11x17)
pdf |
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The diagrams in this page were generated with
EventStudio System Designer 4.0. |
The call flow is explained below by focusing on a different aspects of the flow.
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