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Acapela Group Demo
Terms and conditions

The User of this demo undertakes to use the demo in accordance with customs and standard practices. the User shall ensure that the demo will not be used to create prompts which are unlawful, harmful, threatening, abusive, harassing, tortuous, defamatory, vulgar, obscene, libellous, invasive of another's privacy, hateful, or racially, ethnically or otherwise objectionable.


Acapela TTS for Windows Server

Software Development toolkit designed to give a voice to your telephony and server-based services on Windows Server.

Deliver 24/7 real-time vocal information to your customers

Acapela TTS for Windows Server has been designed to speech enable in real time all sorts of telecommunications applications & server-based services.

Developer benefits

Acapela TTS for Windows Server targets telecom and server-based applications, from single host solutions to distributed architectures. Scalable and client server architecture.


Market apps and services

For voice assistants, IoT, contact centers, IVR, CRM, notification systems, ATM vocal assistants, passenger information, navigation, web-reading, e-learning, digital learning, audio books, etc.


Key benefits


Client-server Architecture
Designed for network telecom applications, from single host solutions to distributed architectures.


High Density performance
Efficient TTS server, offering lower hardware investment with maximum efficiency.


Scalability and multi-processor
Multi-channel engine, optimized for mono and multi-processor systems


Reliable and manageable
Designed to run 24/7, remotely administrable and load balanced to ensure perfect availability of TTS resources for applications.


Standard Compliance
Can be used as a TTS resource in any Voice XML platform with the IETF MRCP v1 and MRCP v2 protocol layer and the support of W3C SSML.

About MRCP

The Media Resource Control Protocol (MRCP) is an Internet Engineering Task Force (IETF) specification that describes a standard interface for media processing resources providing capabilities such as automatic speech recognition (ASR), speech synthesis (text to speech or TTS), speaker identification and speaker verification (SI/SV). The key benefit of this technology is that it allows VoiceXML browsers to inter-operate with third party ASR, TTS, and SI/SV servers using an open, standardized protocol. Interoperability of this nature allows a given VoiceXML solution to be comprised of components from multiple vendors, benefiting technology providers by adding value to their products, while placing greater flexibility and choice in the hands of customers.


About Acapela MRCP add-on 2.400
This new architecture is based on the award winning UniMRCP open source project. Acapela MRCP add-on 2.0 is a plugin to the UniMRCP server stack which implements MRCP 2.0 and 1.0 protocols.


Available for Windows Server 2008/2008 R2/2016 and  Linux RHEL ES 6, and 7 Debian 6 & above, Ubuntu 12 & above.

Technical Specifications

  • Server
    • Supported OS for Server (reference platforms): Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Server 2016.
    • Running modes: Remote (IP) or Local, as a desktop process or as a service.
    • Performance monitor, event viewer log, configuration tool.
  • Client
    • Supported OS for Client (Reference platforms): Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Server 2016
    • Acapela TTS for Linux Server “client” works also with Acapela TTS for Windows Server.
    • Can work in local mode on the same platform as the Server.
  • API, Development Language and Text Input
    • APIs: Proprietary API (NSCAPI), Microsoft SAPI 5.1 and 5.3
    • Markup languages: SSML (VoiceXML 2.0).
    • Development languages: C, C++.
    • Text input: Unlimited vocabulary, unlimited text size, row text, phonetic input.
    • Text normalization: dates, time, currencies, units, URL/emails, abbreviations and exceptions.
  • Audio Output
    • Output stream: multimedia device, file, memory buffer, Stream (SAPI 5), file (PCM,WAV, MP3).
    • Audio sampling rate: 8khz (telephony) A-law, μ-Law or PCM.
    • Optional additional voices at 22khz.
  • Additional Modules and Components
    • MRCPv2 (Media Resource Control Protocol), MRCPv1
    • SAPI
    • Net Wrapper
  • Please contact us for more information.

Pricing info

The Acapela TTS for Windows Server consists of two parts:


  • The Software Development Kit is a developer license (with libraries, sample code) and support and maintenance service. You pay a yearly fee.


  • The Commercial licence: When a product/application/service has been developed incorporating our software, a royalties-bearing agreement will be worked out. The level of royalties will depend on the number of units, on the voices and on the languages used.