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<concept id="GUID-F61FEF82-FD8F-5C5B-9125-A6DE4569EAF3" xml:lang="en"><title>Architecture</title><shortdesc>The architecture section shows the relationship between the core

telephony APIs and the functionality they provide to the client applications. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>The API defines a core set of functions, that many telephony devices and

services support. Applications can use the APIs directly to access the telephony

devices. The interfaces are derived from by other telephony related APIs,

for example the GSM APIs. The derived APIs provide more advanced functionality. </p>

<p>The APIs uses the Symbian platform client/server framework.

The APIs provides <b>R</b> classes that send requests to the telephony server.

The server in turn passes requests to an appropriate plug-in module that handles

the physical device. </p>

<section id="GUID-6C5EE6BF-1059-569E-A227-869BA4D9585E"><title>Structure of

Core Telephony API</title> <p>The Core telephony APIs defines generic interfaces

that supports a limited set of telephony functionality. The interfaces are

based on three fundamental abstractions. </p> <p>The fundamental abstractions

are phones, lines, and calls. All requests to the telephony server are made

through a server session through a phone, line, call or data port. The telephony

server also contains fax functionality, but this is not directly available

to applications. </p> <p>The following diagram illustrates the class hierarchy

used to implement the core client-side interface. </p> <fig id="GUID-32A0E5DA-1DD9-5E09-8CAC-C7EB3E30DBFB">

<title>              Core Telephony Blocks            </title>

<image href="GUID-9FFBC03F-33D8-55BB-BD45-09FDE61A0F1F_d0e41839_href.png" placement="inline"/>

</fig> <p>The following sections define the root server session, and each

of the fundamental core telephony classes. </p> <ul>

<li id="GUID-420F984A-0104-567C-AEE8-6ACCC5D6A982"><p> <xref href="GUID-F61FEF82-FD8F-5C5B-9125-A6DE4569EAF3.dita#GUID-F61FEF82-FD8F-5C5B-9125-A6DE4569EAF3/GUID-4D7E5B0D-6E85-5DC3-91E1-21983D945126">Root server</xref>  </p> </li>

<li id="GUID-B4CB6450-BA1B-5179-BFF9-B1758B573A3C"><p> <xref href="GUID-F61FEF82-FD8F-5C5B-9125-A6DE4569EAF3.dita#GUID-F61FEF82-FD8F-5C5B-9125-A6DE4569EAF3/GUID-E4AEF2EC-3300-5A72-A83D-36489048261E">Phone sub-session</xref> </p> </li>

<li id="GUID-F99C83E3-13E3-54D5-896A-67C635A7CE77"><p> <xref href="GUID-F61FEF82-FD8F-5C5B-9125-A6DE4569EAF3.dita#GUID-F61FEF82-FD8F-5C5B-9125-A6DE4569EAF3/GUID-F41559A2-23F2-5236-8534-2D6D754763DB">Line sub-session</xref>  </p> </li>

<li id="GUID-68170DCA-F96C-584B-82A9-DE9AB2E11240"><p> <xref href="GUID-F61FEF82-FD8F-5C5B-9125-A6DE4569EAF3.dita#GUID-F61FEF82-FD8F-5C5B-9125-A6DE4569EAF3/GUID-6213A0E8-AFAC-534C-9B90-D57A246ADECB">Call sub-session</xref>  </p> </li>

</ul> </section>

<section id="GUID-4D7E5B0D-6E85-5DC3-91E1-21983D945126"><title>Root server</title> <p>The

client applications must open a connection to a root server to use the telephony

server. The root session enables the clients to access information and functionality

of the available telephony resources. The interface provides the functions

that allow clients to: </p> <ul>

<li id="GUID-5CAE04B6-BEB7-5C57-A164-A58402B57085"><p>load and unload the

telephony system (TSY) modules. </p> </li>

<li id="GUID-432680C6-AD8F-524D-8267-05BA95685C29"><p>list the number of phones

that are supported by the loaded TSY modules. </p> </li>

<li id="GUID-49009163-2641-5988-847D-4AA5ADE23F99"><p>get the information

about the phones in the loaded TSY modules </p> </li>

<li id="GUID-CCA9677E-274B-508B-A9A8-F7440D7C6561"><p>close an open root session </p> </li>

</ul> <p>The clients must open a sub-session to access functions related to

a phone, line, or call. The sub-sessions are created using an object of the

associated class. </p> </section>

<section id="GUID-E4AEF2EC-3300-5A72-A83D-36489048261E"><title>Phone sub-session</title> <p>The

phone sub-session provides access to functionality associated with a specific

phone. The API provides the functions that allow clients to: </p> <ul>

<li id="GUID-E6229C31-E7E1-53BB-A52B-583D3C35AAD7"><p>open and close phone

sub-sessions. </p> </li>

<li id="GUID-4492B80C-30A3-5594-8E62-14E437F068F8"><p>get information about

phone capabilities. </p> </li>

<li id="GUID-D6CE31E0-02F9-5847-8A96-2485B9CF2D41"><p>get information about

the current phone status. </p> </li>

<li id="GUID-C7F23357-DE47-5867-BA8A-0116196D8CED"><p>list the number of lines

that are supported by the phone. </p> </li>

<li id="GUID-83CB2126-BCC6-57F7-B309-AC2705AADFE2"><p>get information about

the supported lines, including their status and capabilities. </p> </li>

<li id="GUID-07CC7C36-ED3C-5367-8F6B-A9A186F9D79A"><p>initialise the phone

to a known state. </p> </li>

<li id="GUID-AFC632E5-C18B-5940-916E-BCED5A20478C"><p>get notification of

phone events, for example when the phone hardware is connected. </p> </li>

</ul> </section>

<section id="GUID-F41559A2-23F2-5236-8534-2D6D754763DB"><title>Line sub-session</title> <p>The

line sub-session provides access to functionality associated with a specific

line. The API provides functions that allow clients to: </p> <ul>

<li id="GUID-7D3B2EC9-C135-520D-B726-B1C2F483CBBC"><p>open and close line

sub-sessions. </p> </li>

<li id="GUID-83AFBEF9-3793-58E9-B269-1B9641F7EA8B"><p>get information about

the line capabilities. </p> </li>

<li id="GUID-47D54595-B4A9-5A86-B756-D7775781185E"><p>get information about

the current line status. </p> </li>

<li id="GUID-200BFAA9-C8A1-5BE6-82B0-6AC02CB507A4"><p>get information about

the status of the hook. </p> </li>

<li id="GUID-4C895915-87EE-5DE3-A832-1009FE784E13"><p>get notification of

events associated with the line, for example notification of an incoming call. </p> </li>

<li id="GUID-DE2E9E65-2CA3-55E7-B311-9D760ACDAAEE"><p>list the number of calls

that are supported by the line. </p> </li>

<li id="GUID-1B850E94-67A4-5CD4-84E2-2C7BDAE5C5EE"><p>get information about

the calls in a line. </p> </li>

<li id="GUID-1C06901B-CCFB-58C8-AE91-AFFFC90E1B0F"><p>get notification of: </p> <ul>

<li id="GUID-626003CD-E70A-5792-8D4B-D25F6D8AC979"><p>an incoming call </p> </li>

<li id="GUID-5EDA6788-6CFC-5F96-8A99-34427BCFC475"><p>change in hook status </p> </li>

<li id="GUID-3E86AA03-9C98-58B5-B3A5-276F7259D992"><p>change in line status </p> </li>

<li id="GUID-354F44A0-0E1F-5EB4-984A-BC716DF39546"><p>a new call added to

the line </p> </li>

</ul> </li>

</ul> </section>

<section id="GUID-6213A0E8-AFAC-534C-9B90-D57A246ADECB"><title>Call sub-session</title> <p>The

call sub-session provides access to functionality associated with a specific

call. The API provides functions that allow clients to: </p> <ul>

<li id="GUID-CFDD4AC1-F9D0-5974-82A1-0ABB1C2ED50C"><p>open a sub-session with

a specific call that has already been created. </p> </li>

<li id="GUID-0C308553-1535-51B0-B8C9-B9564367970C"><p>open a sub-session with

a new call. </p> </li>

<li id="GUID-7CDE173A-3F85-51F4-9631-FC3FE5D1F80E"><p>close an open call. </p> </li>

<li id="GUID-DD08B53F-976D-53D8-9A42-2F4BAA47A24C"><p>obtain information about

the call capabilities. </p> </li>

<li id="GUID-F10EC392-2CED-5E66-92EA-64C0A595BC1A"><p>obtain information about

the current call status. </p> </li>

<li id="GUID-3FF03A4A-7A92-57CC-B193-40952B5FEF5A"><p>dial a number and establish

a connection with a remote modem. </p> </li>

<li id="GUID-E997DC16-321A-56DE-8C80-34247477B1F8"><p>answer an incoming call. </p> </li>

<li id="GUID-AFC5EA7A-A468-5802-ACC9-D5965A3EFCA3"><p>connect to a call which

has already been established. </p> </li>

<li id="GUID-6517D9BC-B1A8-5A41-BEED-56323FA19236"><p>request access to the

raw data stream from a Data Call. </p> </li>

<li id="GUID-6802C616-078F-5BA8-A404-99571FF65002"><p>terminate an active

call. </p> </li>

<li id="GUID-A4492EAB-7A42-57DB-A30D-59B2A868BB04"><p>transfer call ownership

to another client. </p> </li>

<li id="GUID-876EDE2F-2716-543E-84CF-06BA8F3EFC86"><p>retrieve information

about the bearer associated with an active connection </p> </li>

<li id="GUID-AB616241-8161-582F-A031-B655B7DEBC9F"><p>get notification of

the hook status, or the progress of a call. </p> </li>

<li id="GUID-C453CBFD-4083-5A9B-B067-366C5BF423DD"><p>get the current progress

state and duration of the call </p> </li>

</ul> </section>

</conbody></concept>