Look at the config and admin guides.
http://www.cisco.com/en/US/products/sw/custcosw/ps1006/products_installation_and_configuration_guides_list.html
For example for 8.5, you can get info on page 499.
Hemal

From: Cisco Developer Community Forums [mailto:cdicuser@developer.cisco.com]
Sent: Tuesday, March 12, 2013 1:12 AM
To: cdicuser@developer.cisco.com
Subject: New Message from subrahmanyam juluru in Customer Voice Portal (CVP) - CVP - All Versions: redundancy/Load Balancing of Nuance Speech Server(NSS) 5.0

subrahmanyam juluru has created a new message in the forum "CVP - All Versions": -------------------------------------------------------------- Hi All,
we integrated CVP with Nuance Speech server ( Standalone Environment).
The Environment is
Nuance Speech Server 5.0 and Nuance Recognizer 9
Cisco CVP 8.0 and Voice Gateway
Nuance was installed in Active and Standby Servers.
can any body have idea how to do redundancy/load balancing of NSS in the Voice gateway?
Hightly appreciate for your quick reply.
Regards
Juluri.

--
To respond to this post, please click the following link: http://developer.cisco.com/web/cvp/forums/-/message_boards/view_message/12906313 or simply reply to this email.

With MRCP version 1 you can't do anything on the gateway in CVP Standalone mode but you can select the ASR and TTS servers programmably in the application by setting the VoiceXML properties com.cisco.asr-server and com.cisco.tts-server using substitution in order to select one from your ASR/TTS server farm or point to an alternative server on failures by catching the ASR / TTS hot events.
With MRCP version 2, as it's using SIP, you should be able to use the gateway ip host static DNS SRV config approach to specify alternative servers and load balance across them.  Not it tried personally with SIP to MRCP servers but the principle is the same as for SIP calls to anywhere else such as the CVP server farm.

You can set the Vxml Properties either in the root document (as you mention) so it lasts during the entire application. Or if necessary, in the Settings tab of any Voice Element (but this will only last for the duration of that element) - so if you need to change ASR servers in the middle of an application, then you'll need to set this property in EVERY voice element's Settings tab. Look in the IOS VXML Programming Guide for the information to list in the URL. It'll match what is usually entered into the Gateway Configuration. For example: Name: com.cisco.asr-server Value: rtsp://NuanceServer/recognizer Perhaps it'll be best to do it within each Voice Element and use a variable within the value rtsp://{Data.Session.NuanceServer}/recognizer - then you can just change the value of your Session variable when necessary. On 3/18/2013 9:20 AM, Cisco Developer Community Forums wrote: subrahmanyam juluru has created a new message in the forum "CVP - All Versions": -------------------------------------------------------------- Dear David, Thanks for your reply to my question. I verified in my production setup environment and we are using the MRCP version1. as you mentioned pointing VoiceXML properties (com.cisco.asr-server for ASR Server and com.cisco.tts-server for TTS Server) through application level. I found some VoiceXML Property settings in the call studio IDE as  Application name ->Right Click->Properties->call Studio->Root Doc Settings. if this path is correct can you please guide me what are the values i need to send throush this Root Doc Settings. can yo please give more elaborate information for MRCP Version1 settings. Regards Juluri.  -- To respond to this post, please click the following link: http://developer.cisco.com/web/cvp/forums/-/message_boards/view_message/13196274 or simply reply to this email. -- Janine Graves

I'm not a gateway person, but I think you'd want: ip host asr-en-us 172.23.25.41 ip host asr-en-us-backup 172.23.26.41 The second entry with "-backup" appended is used automatically as a backup when working with ICM Microapps. So, worthwhile to have it, just in case. With Studio, you have to manually manage switching to the backup (I think!) - so in the Studio application, you could have a Session Variable called NuanceServer And assign the value to either asr-en-us or asr-en-us-backup as necessary. -- Janine Graves

You can manage this all in Studio. But this is all the help I can provide on this.

1. Create a session variable named NuanceServer and assign 'asr-en-us'
2. In each voice element that collects caller input, do the following:

a) create Session variable named LastElement, assign it the name of the element you're inside of, create Before, press Add
b) in the Settings tab, set the VXML Property name: com.cisco.asr-server  value:{Data.Session.NuanceServer}
c) create a PageEntry element called Goto_<name of the voice element>  (eg, Goto_MainMenu)
d) connect the PageEntry to the voice element.

3. Create a HotEvent and catch to event: error.noresource

4. Connect to a decision element named checkServer.
a) This element checks if the value of Session variable NuanceServer equals as string asr-en-us then exit state SetBackup. Otherwise exit state:SecondError
b) Connect the SecondError exit state to tell the caller there's an error and return the call to ICM (or transfer to an agent).
c) Connect the SetBackup exit state to an App Modifier named setBackupServer. In its Data tab, create a session variable named NuanceServer and assign 'asr-en-us-backup'

5. Connect the setBackupServer element to a decision element (CheckLastElement) that has one exit state for each possible voice element you need to go back to.  For example, if Session Data LastElement equals as String Constant String MainMenu, the return exit state Main Menu.