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<!DOCTYPE concept
  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
<concept id="GUID-4913E341-5283-5B48-A00B-665658FFDEB1" xml:lang="en"><title>Concepts</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>This section describes the concepts related to the packet data telephony. The packet data telephony API provides interface to access the packet switched service of a network. </p> <p> </p> </conbody></concept>