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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 Linux Server

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

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

Acapela TTS for Linux Server has been designed to speech enable in real time all sorts of telecommunications applications and 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, audio books, audio production, simulation and training, e-learning, serious gaming, 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.


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.


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 6/7, Ubuntu 12 and above.

Technical Specifications

  • Version
  • Server
    • Reference platforms for Server: Linux RedHat ES 6 and 7, Debian 6 and above, Ubuntu 12/14.
    • Running modes: Remote (IP), as a desktop process or as a service.
  • Client
    • Reference platforms for Client: Linux RedHat 6 and 7, Debian 6 and above, Ubuntu 12/14.
    • Acapela TTS for Windows Server “client” works also with Acapela TTS for Linux Server.
    • Can work locally, on the same platform as the Server
  • API, Development Language and Text Input
    • APIs: Proprietary API (NSCAPI).
    • 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: Memory buffer, 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, MRCPv1

Pricing info

The Acapela TTS for Linux Server offer consists of two parts:


  • The Software Development Kit is a developer license (with libraries, sample code) and support and maintenance service for the first year. You pay a once only fee.


  • The Commercial Licence:

When the text to speech is used in live mode, the price of the licence reflects the maximum of concurrent users and the number of languages activated.

When the text to speech is used for audio production (creation of audio files used several times), the price is based on prepaid packages of speech hours.


Please note: there is a yearly fee for the support and maintenance service.