Architecture Diagram: Runtime and Operations
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The following high-level diagram illustrates the Speech Server components and the relationships between them as applied to the run-time stage of application deployment. This diagram assumes that the organization is running a distributed deployment where components such as Speech Server, Microsoft Operations Manager (MOM), and a Web server run on separate computers.
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Call Flow
- A call comes into a Session Initiation Protocol (SIP) peer from either a Voice over IP (VoIP) client, a SIP client, or a telephony client (through a PSTN), which prompts the SIP peer to create a request.
- The SIP peer contains a dial plan, which maps a phone number to an IP address on the??computer running Speech Server. The SIP peer sends a SIP invite to Speech Server. The SIP invite is received by the Telephony Application Proxy (TAP).
- TAP sends an HTTP request for the speax file that activates the requested application. TAP also sends a SIP redirect message to the SIP peer. The redirect message contains the location of the requested application.
- The redirect message causes the SIP peer to send a SIP invite to ASP.NET through the TelephonySession. The TelephonySession receives the subsequent invite and creates a remote procedure call (RPC) channel between the TelephonySession and Speech Engine Services??(SES). SES??allocates a speech recognizer, a speech synthesizer, and a dual tone multi-frequency (DTMF) processing engine for the call.
- The requested application is started and either accepts or rejects the invite. The SIP peer receives and acknowledges this response.
- When the call is established, the TelephonySession raises an event to the application, which can then start speaking and listening.
- When the caller hangs up, the endpoint client informs the SIP peer that the call is complete.
- The SIP peer relays the message to Speech Server, which releases the resources and informs the application that the call is complete.
- Throughout the duration of the call, information is written to the event trace log (ETL) file. Administrators can run the command-line utility MssLogToDatabase.exe to write the content of the ETL file to the SQL??Server tuning database. This utility can be run manually, in a batch file, or using the Windows scheduler. For more information, see Import Log Files into the Tuning Database.
- Administrators can use??the Speech Server??Management Pack for MOM 2005 to monitor important errors, warnings, and informational events that??Speech Server??writes to the application event log.