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AWS Lex Plugin 2.4.0 Released

November 18 2021

Amazon Web Services (AWS) Lex Plugin 2.4.0 to the UniMRCP Server (UMS) has been released.

The plugin is based on the following components:

  • UniMRCP Server 1.7.0
  • AWS SDK 1.8.129
  • AWS Lex V2
  • Libevent 2.1.9
  • Libnghttp2 1.42.0

The binaries are currently available for the following Linux distributions:

  • Red Hat / CentOS 7 (unimrcp-lex-1.7.6-1.el7.x86_64.rpm)
  • Red Hat / CentOS 8 (unimrcp-lex-1.7.6-1.el8.x86_64.rpm)
  • Ubuntu 18.04 LTS (unimrcp-lex_1.7.6-bionic_amd64.deb)
  • Ubuntu 20.04 LTS (unimrcp-lex_1.7.6-focal_amd64.deb)

This release adds support for transparent session attributes of the Lex V2 API. The release also provides a few fixes and improvements in the existing functionality.

The detailed list of changes introduced in this release follows.
New Features
  • Allow session attributes of the Lex V2 API to be transparently specified either globally in the configuration file or per MRCP request via vendor-specific parameters.
  • Allow the session id of the Lex V2 API to be explicitly specified by the client by means of a vendor-specific parameter 'session-id'.
Fixed Problems
  • Fixed a possible segfault on processing the header field Logging-Tag having an empty [no] value.
  • Fixed processing of AWS profile parameters, including 'aws-arn-role', passed per MRCP request by the client.
  • Skip a fallback intent having the dialog action set to 'close' with no transcription, if the attribute 'skip-empty-results' is set to 'true', which is the default behavior.
Configuration Parameters
  • Added new attributes in the format of 'x-amz-lex.*' to the element 'streaming-recognition'. The name of the attribute must start with a prefix 'x-amz-lex' and a separator '.' must be used in the path. For example: x-amz-lex.audio.start-timeout-ms.
Miscellaneous
  • Updated the Usage Guide to reflect the changes introduced in this release.

Visit the Lex plugin page for more information.

http://www.unimrcp.org/lex

Thank you for using UniMRCP.

--
Arsen Chaloyan
Author of UniMRCP
http://www.unimrcp.org

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