diff -r 43e37759235e -r 51a74ef9ed63 Symbian3/SDK/Source/GUID-85CA1089-3F58-5E82-86A4-4674C893B25F.dita
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/SDK/Source/GUID-85CA1089-3F58-5E82-86A4-4674C893B25F.dita	Wed Mar 31 11:11:55 2010 +0100
@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
+<!-- This component and the accompanying materials are made available under the terms of the License 
+"Eclipse Public License v1.0" which accompanies this distribution, 
+and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
+<!-- Initial Contributors:
+    Nokia Corporation - initial contribution.
+Contributors: 
+-->
+<!DOCTYPE concept
+  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
+<concept id="GUID-85CA1089-3F58-5E82-86A4-4674C893B25F" xml:lang="en"><title> Overview</title><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>The SIP Codec API provides functions to encode and decode SIP headers and
+their fields. It converts SIP messages from the UTF-8 ASCII format to the
+API implementations internal structure and from the API implementations internal
+structure to the UTF-8 ASCII format. This implementation validates the SIP
+message syntax according to the SIP BNF definition and supports serialization
+and de-serialization of objects belonging to the SIP message structure. </p>
+<p>This implementation is provided in a shared DLL and is run in the context
+of the user. It creates class instances in the user heap area which means
+the instances cannot be shared between different users. </p>
+<section id="GUID-CB250850-D04A-5993-B0C9-3CC1761C686B"><title>Architectural
+relationships</title> <p>The SIP Codec API does not require any interfaces. </p><p><b>Capability
+information</b> </p><p>There is no capability required when you use the SIP
+Codec API. This API is valid for all platforms running Symbian OS version
+9.1. </p><p><b>Extending the API</b> </p><p>SIP Codec API cannot be extended. </p> </section>
+<section id="GUID-D3DA4AFB-AE7F-5496-9DA2-B6FFA0A59DF0"><title>Class structure</title> <p>The
+logical type of the SIP Codec API is Library API. This interface contains
+synchronous functions that do not block, but return immediately and it uses
+only local objects. </p> <p>The following illustration shows the relationships
+of the SIP Codec API classes. </p> <fig id="GUID-B09DF64C-B185-54BA-A7C3-49B8E561DDCD">
+<title>                 Relationships of the SIP Codec classes - Part 1  
+            </title>
+<image href="GUID-EE556214-BFB8-582E-ACD9-5287D7C64EFA_d0e340929_href.jpg" placement="inline"/>
+</fig> <fig id="GUID-76054C58-E841-5103-AB33-27754D80B757">
+<title>                 Relationships of the SIP Codec classes - Part 2  
+            </title>
+<image href="GUID-9D5641BC-226B-538F-B805-48511781B7C1_d0e340938_href.jpg" placement="inline"/>
+</fig><p>The SIP Codec API defines the functions required to create the SIP
+headers of a SIP message. CSIPHeaderBase is the base class for all SIP headers.
+A client creates a new instance of the CSIPXHeader class, where “X” is the
+name of the header required, and sets the values of the header with the setter
+functions of this class.</p></section>
+<section id="GUID-99EFD964-C3AB-5974-8B13-913D271B3232"><title>Memory used</title> <p>The
+amount of memory used by every header object of the SIP Codec API is equivalent
+to the memory used by the header as text (class + the size of SIP headers). </p> </section>
+</conbody></concept>
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