Nuance Speech Server provides an MRCP V1.0 interface to text-to-speech and speech recognition components. The default RTSP port number to use to connect to the Nuance Speech Server must match the Nuance Server configuration. By default this value is 4900.
An example of the VRBE RecoService entry configuration settings required for speech recognition in configuration file /var/dirTalk/DTBE/native/aix/default.cff are shown below:
RecoService=Reco_GB PlugInClass=com.ibm.telephony.directtalk.mrcp.MRCPReco InitSessionString=URI=rtsp://1.23.45.678:4900/media/speechrecognizer RecoType=Recoen_GB ;
For larger deployments handling more than one trunk of calls, it may be necessary to use more than one speech server to process text-to-speech and speech recognition requests. To do this a load-balancing application such as WebSphere Edge Server is used to distribute text-to-speech and speech recognition requests to two or more speech servers. All text-to-speech and speech recognition initialization requests are sent to a load-balancing address. The load balancer receives these requests and forwards them to one of a cluster of speech servers. To use Nuance speech servers in this way, a number of changes to Blueworx Voice Response and Nuance configuration need to be made.
RecoService=Reco_GB PlugInClass=com.ibm.telephony.directtalk.mrcp.MRCPReco InitSessionString=URI=rtsp://1.23.45.678:554/media/speechrecognizer RecoType=Recoen_GB ;
With load-balanced systems, port 554 is used instead of 4900. The changes required to the Nuance configuration file NSSserver.cfg are:
| Variable | Value |
|---|---|
| server.transport.bindrtptoip | The IP address of the speech server |
| server.rtp.strictSdpMediaPortUse | 0 |
| server.mrcp1.transport.port | 554 |
Speech recognition requests are forwarded to one of a number of Nuance voice servers using the same port number (554). When a speech recognition session has been set up on a Nuance voice server and Blueworx Voice Response has received a response, speech recognition traffic passes to and fro directly (not through the load balancer machine).
Nuance Speech Server provides an MRCP V2.0 interface to text-to-speech and speech recognition components.
An example of the VRBE RecoService entry configuration settings required for speech recognition in configuration file /var/dirTalk/DTBE/native/aix/default.cff are shown below:
RecoService=RecoMRCPv2 Enabled=yes RecoType=Reco_MRCPv2_Type PlugInClass=com.ibm.telephony.directtalk.mrcp.MRCPv2Reco InitSessionString=URI=sip:mrcpv2@mrcpv2server.com ;
Lumenvox provides an MRCP V1.0 interface to text-to-speech and speech recognition components. The default RTSP port number to use to connect to Lumenvox must match the Lumenvox configuration. By default this value is 554.
An example of the VRBE RecoService entry configuration settings required for speech recognition in configuration file /var/dirTalk/DTBE/native/aix/default.cff are shown below:
RecoService=Reco_GB PlugInClass=com.ibm.telephony.directtalk.mrcp.MRCPReco InitSessionString=URI=rtsp://test1.blueworx.com:554/media/recognizer RecoType=Recoen_GB ;
Lumenvox provides an MRCP V2.0 interface to text-to-speech and speech recognition components.
An example of the VRBE RecoService entry configuration settings required for speech recognition in configuration file /var/dirTalk/DTBE/native/aix/default.cff are shown below:
RecoService=RecoMRCPv2 Enabled=yes RecoType=Reco_MRCPv2_Type PlugInClass=com.ibm.telephony.directtalk.mrcp.MRCPv2Reco InitSessionString=URI=sip:mrcpv2@mrcpv2server.com ;