CEA call flow

In a Web telephony session, users can make phone calls using the ClicktoCall widget in their Web browsers. The call flow diagram illustrates the Communications Enabled Applications (CEA) call flow.

Note: The system application must first be configured with the IP private branch exchange (PBX) address.
The following configuration applies to this call flow:
  1. A user clicks the ClickToCall widget, which sends an HTTP REST request.
  2. The Web container calls the system application.
    • An HTTP servlet interprets the REST request.
  3. The system application sends SIP messages to the IP PBX using the ECMA TR/87 standard protocol.

    In addition to TR/87, PBX vendors can choose to expose a web service interface based on a Web Services Description Language (WSDL) file that is provided with CEA. This WSDL file is included in the installation path, app_server_root/systemApps/commsvc.ear/commsvc.rest.war/WEB-INF/wsdl/ControllerService.wsdl. Using this WSDL file enables you to configure CEA to call out to a PBX through a web service instead of relying on TR/87.

    Restriction: The IP PBX must support the ECMA TR/87 protocol or the CEA web service interface.
  4. The IP PBX notifies the user agent client (UAC) to call the user agent server (UAS).
  5. A call is established between the two users.
    Note: UAC and UAS are SIP instances.
Figure 1. CEA call flowcall flow diagram
Concept topic    

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Last updated: April 20, 2014 08:46 PM CDT
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