Understanding Call Control XML Interpreter
Call Control
XML Interpreter is an interpreter for calls that are made to a telephony
system. An interpreter is developed for this purpose from IBM Alphaworks
for the AIX and Websphere. This interpreter interprets the call control
applications by retrieving the URIs. This is an interpreter for Websphere
Voice Response. This interpreter has a lot of sample applications along
with the documentation which gives the users the kick-off needed to start
writing applications using the Call Control XML.
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Call Control
XML is an XML based standard for handling calls from any telephony system.
This provides the developers to develop highly sophisticated applications
which can handle the calls received by a telephony system. Call Control
XML follows the Voice XML model and is an open standard. This is a non-proprietary
markup language and hence can be used by anyone. Call control XML allows
you to easily migrate applications developed for one system to applications
for another system.
To install
and use the Call Control XML Interpreter, you need to have Websphere Voice
Response with AIX 5.1 and ML3 and the Voice Response Beans Environment
3.1.0.10. The Java tool that is required is IBM JVM 1.4.1. A Voice Response
Node (VRNode) that is compliant with the WebSphere and JVM is also necessary.
The following steps are to be followed for the installation of the CCXML
Interpreter.
1. To run
a Call Control XML Interpreter or a VoiceXML browser, the .jar files that
have been downloaded has to be copied to the “/var/dirTalk/DTBE/server/”
directory.
2. Give Read and Execute access to these .jar files for all the groups.
3. Backup the dtjflog file.
4. Copy the dtjflog file to “ /var/dirTalk/DTBE/native/aix/”
directory.
5. Copy start.ccxml to “ /var/dirTalk/DTBE/native/aix/ccxml/”
directory.
6. Give Read and Execute access to the start.ccxml file for all the groups.
Multiple
call handling can be done easily through the use of Call Control XML.
Outgoing calls can also be placed and incoming calls can be answered with
the Call Control XML. It is possible to invoke interactive voice applications
through the Call Control XML. This XML handles asynchronous events easily.
Call Control XML can handle a lot of signals and events related to the
status of the signal. It also allows passing of messages. With its ability
to handle multiple calls, multiparty conferencing can be done easily through
Call Control XML.
The code
given below is a sample Call Control XML file:
<?xml
version="1.0" encoding="UTF-8"?>
<ccxml version="1.0">
<var name="aVar" expr="'This is a variable'"/>
<log expr="'The variable value is : ' + aVar"/>
<exit/>
</ccxml>
In the above
the XML declaration is the start of the document, since CCXML is basically
an XML document. The code shows a variable declared and how its value
is logged. The <var> tag is used to declare a variable. The <log>
tag is used to log some information in the logging stream. The <exit/>
tag is used to terminate all the calls and end the session. The tags are
enclosed in the <ccml> and </ccml> tags.
An existing
Voice XML application can be made sophisticated if Call Control XML is
used along with that application. Both Voice XML and Call Control XML
can work independent of each other. But using them together enables a
developer to build very rich and interactive applications for any telephony
system. It should be noted that a plain voice xml application cannot handle
multiparty conferencing and Call control XML does not have voice capabilities
and it has to rely on voice xml for voice capabilities. Making both these
markup to work together will help a developer to develop very rich voice
applications.
Web Servers
are used to host the Call Control XML applications. These web servers
may also have the Voice XML applications and other Web applications in
them. The Call Control XML applications are retrieved by the CCXML interpreter
by using the URIs. The Call Control XML interpreter from IBM is designed
to work in IBM Websphere Voice Response system. This is an interactive
voice response (IVR) system from IBM.
The CCXML
interpreter from IBM implements partial CCXML specification. This interpreter
handles all the incoming calls and routes them accordingly. It also invokes
necessary dialogs so that the application interacts with the caller. This
interaction can also be achieved using Voice XML. This interpreter allows
the user to place outbound calls. This interpreter does not provide any
conferencing facility at this stage. This is because the Websphere Voice
Response system does not have this capability. If the conferencing capability
is supported in the Websphere Voice Response system, then that feature
may be extended to the CCXML interpreter to provide multiparty conferencing
facility.
To be more
technical, the Call Control XML interpreter is a Java thread. When an
event is sent to the thread, the thread constructs a DOM tree from the
CCXML document and then invokes the transitions within this document.
The thread can receive events from voice response systems or other instances
of the interpreter itself.
Thus CCXML
is a markup language that is used for superior call control features for
any telephony systems. Apart from the IBM CCXML Interpreter, there is
another product known as Oktopous™ Media Server from Phonologies
that also uses an CCXML Intepreter to give rich interactive experience
to the callers.
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